New Build - No Display Output - HELP!

[SamGB]

Hi all,

I have just spend the weekend building a new PC. The specs are the following:

Processor: AMD Ryzen 7 9800X3D 4.7 GHz 8-Core Processor
CPU Cooler: ARCTIC Liquid Freezer III Pro 360 A-RGB
Motherboard: GIGABYTE X870E AORUS PRO
RAM: G.Skill Trident Z5 XMP 32GB (2x16GB) DDR5 PC5-51200C32 6400MHz Dual Channel Kit
Graphics Card: Asus GeForce RTX 5080 Prime OC
SSD: Samsung 990 PRO NVMe
PSU: Corsair RM1000e
Case: Fractal Design Meshify 3 XL Ambience Pro RGB ATX Full Tower Case

I have had numerous issues trying to get a successful POST and I've now got to the point where the motherboard BIOS code is reporting an A6 (which I believe means I can proceed to install an OS). The concern that I have right now is that there doesn't seem to be any display output when I connect a HDMI or Display Port cable to the back of my graphics card. The only way I can get any display is when I use the onboard graphics.

I have tried the following without any luck:

1. Reseating the GPU several times into the PCI Express 16 slot.
2. Unplugged and replugged the power connectors to and from the GPU and PSU itself.
3. Installed an old graphics card (GeForce GTX 780) to the same PCI Express x16 slot.
4. Disabled the onboard graphics from the BIOS (as it was set to Auto) to force it to use the Geforce RTX 5080
5. Cleared CMOS.

When I have installed the Geforce GTX 780 and connected it via HDMI cable. I'm able to get a display from it when booting up (it threw an error about the need to connect it up to a PCI Express Power cable on boot but as least it provided a display output)

When I'm able to access the BIOS, it does seem to recognise that there is something in the PCI Express X16 slot as it specifies the following: PCIe 5x16 @ 5.0 x16

Should I be concerned here? Is my GPU faulty? Or should I just continue with the Windows installation regardless? Any suggestions/advice would be welcome on how to proceed here.

 

[Craig_d1]

Hi all,

I have just spend the weekend building a new PC. The specs are the following:

Processor: AMD Ryzen 7 9800X3D 4.7 GHz 8-Core Processor
CPU Cooler: ARCTIC Liquid Freezer III Pro 360 A-RGB
Motherboard: GIGABYTE X870E AORUS PRO
RAM: G.Skill Trident Z5 XMP 32GB (2x16GB) DDR5 PC5-51200C32 6400MHz Dual Channel Kit
Graphics Card: Asus GeForce RTX 5080 Prime OC
SSD: Samsung 990 PRO NVMe
PSU: Corsair RM1000e
Case: Fractal Design Meshify 3 XL Ambience Pro RGB ATX Full Tower Case

I have had numerous issues trying to get a successful POST and I've now got to the point where the motherboard BIOS code is reporting an A6 (which I believe means I can proceed to install an OS). The concern that I have right now is that there doesn't seem to be any display output when I connect a HDMI or Display Port cable to the back of my graphics card. The only way I can get any display is when I use the onboard graphics.

I have tried the following without any luck:

1. Reseating the GPU several times into the PCI Express 16 slot.
2. Unplugged and replugged the power connectors to and from the GPU and PSU itself.
3. Installed an old graphics card (GeForce GTX 780) to the same PCI Express x16 slot.
4. Disabled the onboard graphics from the BIOS (as it was set to Auto) to force it to use the Geforce RTX 5080
5. Cleared CMOS.

When I have installed the Geforce GTX 780 and connected it via HDMI cable. I'm able to get a display from it when booting up (it threw an error about the need to connect it up to a PCI Express Power cable on boot but as least it provided a display output)

When I'm able to access the BIOS, it does seem to recognise that there is something in the PCI Express X16 slot as it specifies the following: PCIe 5x16 @ 5.0 x16

Should I be concerned here? Is my GPU faulty? Or should I just continue with the Windows installation regardless? Any suggestions/advice would be welcome on how to proceed here.

Seeing as you are ready to install windows via outputting from mobo hdmi, then I'd do that to just get that bit done at least. Reads to me like you have a gpu problem if ya old gtc 780gets recognised, and def not the pcie slot.
how are you connectiong the 5080 to the rm1000e? does it come with an adaptor, so you could try just standard pcie leads from psu? (I'm assuming it comes with a specific pcie to 16 pin lead), but if gpu comes with adaptor, you could try other method to rule out defective cable?

 

[sg0]

hi bud, have you made any changes in the bios to use gen 5 for pci e etc? They can be in multiple places. I would use auto for the time being. Also just stick with the 5080 and use different cables and slots inputs etc until you have exhausted all options for that card

 

[SamGB]

Seeing as you are ready to install windows via outputting from mobo hdmi, then I'd do that to just get that bit done at least. Reads to me like you have a gpu problem if ya old gtc 780gets recognised, and def not the pcie slot.
how are you connectiong the 5080 to the rm1000e? does it come with an adaptor, so you could try just standard pcie leads from psu? (I'm assuming it comes with a specific pcie to 16 pin lead), but if gpu comes with adaptor, you could try other method to rule out defective cable?

Thanks for the response. I'm connecting the Geforce 5080 via the dedicated 12v power cable from the PSU. The GPU does come with an adaptor cable but it's so small in length that I can't it to reach to the PSU sadly

I have just tried updating the BIOS to the latest version just now without any luck. Should I just return the GPU back? It's been just over an month since I bought it from OC, I'm hoping that there won't be an issue returning it back.

What is strange is that after updating the BIOS, it no longer recognises that there is anything in the PCI Express x16 slot. I also had this with before when I booted up the PC for the first time and after clearing CMOS.

 

[SamGB]

hi bud, have you made any changes in the bios to use gen 5 for pci e etc? They can be in multiple places. I would use auto for the time being. Also just stick with the 5080 and use different cables and slots inputs etc until you have exhausted all options for that card

Nope I haven't changed any BIOS settings other than disabling on-board graphics as a test (without any luck). I don't think it's the slot as I have put in an GeForce GTX 780 and I was able to get a display output from it. You reckon its worth buying a different 12v PSU cable then for the graphics card?

 

[sg0]

Thanks for the response. I'm connecting the Geforce 5080 via the dedicated 12v power cable from the PSU. The GPU does come with an adaptor cable but it's so small in length that I can't it to reach to the PSU sadly

I have just tried updating the BIOS to the latest version just now without any luck. Should I just return the GPU back? It's been just over an month since I bought it from OC, I'm hoping that there won't be an issue returning it back.

What is strange is that after updating the BIOS, it no longer recognises that there is anything in the PCI Express x16 slot. I also had this with before when I booted up the PC for the first time and after clearing CMOS.

Im sure you are supposed to use the adapter from the gpu with pci e power cables from the psu? The length should be fine.

Also try an x8 slot if the card has enough room

 

[SamGB]

Im sure you are supposed to use the adapter from the gpu with pci e power cables from the psu? The length should be fine.

Also try an x8 slot if the card has enough room

I have ATX 3.1 PSU which comes with its own dedicated 12+4 PIN PSU cable for connecting PCI Express Gen 5 GPU's. So that is what I have been using. The adaptor that comes with the GPU requires 3 8 PIN PCI-Express cables and slots in the PSU and my PSU only comes with two plus the slot for the dedicated 12+4 PIN connection.

​

 

[Cadder]

I was experiencing similar with my new build and it turned out the monitor needed to be unplugged for 30 seconds with the PC off. When all was powered on again it seemed to work fine.

Also, are you on latest BIOS version?

Edit: if you can enter BIOS with onboard graphics, try setting the GPU pcie lane to gen4 or gen3 and see if you get a signal from the gpu after that. Then it could be a BIOS version issue.

 

[SamGB]

I was experiencing similar with my new build and it turned out the monitor needed to be unplugged for 30 seconds with the PC off. When all was powered on again it seemed to work fine.

Also, are you on latest BIOS version?

Edit: if you can enter BIOS with onboard graphics, try setting the GPU pcie lane to gen4 or gen3 and see if you get a signal from the gpu after that. Then it could be a BIOS version issue.

Just tried that with no joy unfortunately

I did notice that if I remove the 12+4 PIN PSU cable from the GPU, a red light does flash on the card which means it is detecting the fact that there is no cable plugged in? Which may or may not mean something?

I flashed the Gigabyte motherboard to the latest BIOS earlier today as well.

Edit: Let me try your suggestion with the BIOS setting for the GPU PCI-Express Lane.

 

[Cadder]

How long have you left the PC on before turning it back off? I had to leave mine on a while so it could sort out memory training.

How big is the 5080? It's not sagging is it?

 

[SamGB]

How long have you left the PC on before turning it back off? I had to leave mine on a while so it could sort out memory training.

How big is the 5080? It's not sagging is it?

I have left it on for a while, the motherboard gives out status codes which it currently displays A6 (which I believe means I can proceed to install an OS), so it's able to POST and completed all those initial diagnostic checks.

I don't think it's a monitor issue cos as soon as I plug the HDMI cable into the onboard graphics, I get a display output from the same monitor without any issues.

I have also just tried setting the PCI-E lane to Gen 4 but without any luck

I have the Asus GeForce RTX 5080 Prime OC and it's not sagging and I have reseated it about 5 times when doing some tests. I'm kinda out of ideas right now.

 

[Cadder]

I have the 5070 Ti ASUS Prime OC.
Turning off the monitor at the wall to clear the capacitors was the solution for me. It could be a communication issue with the monitor and it just needs clearing.

Failing that, and considering everything you've mentioned, you might want to test the GPU. Do you have another machine you can try it in?

 

[SamGB]

I have the 5070 Ti ASUS Prime OC.
Turning off the monitor at the wall to clear the capacitors was the solution for me. It could be a communication issue with the monitor and it just needs clearing.

Failing that, and considering everything you've mentioned, you might want to test the GPU. Do you have another machine you can try it in?

I'm out of all ideas right now so I'll try it again.

Did you connect your 5070 Ti using the dedicated 12+4 PIN PSU cable for connecting PCI Express Gen 5 GPU's?

I'm not sure the 5080 will fit in my old PC but I can give it a try I suppose.

 

[Craig_d1]

Thanks for the response. I'm connecting the Geforce 5080 via the dedicated 12v power cable from the PSU. The GPU does come with an adaptor cable but it's so small in length that I can't it to reach to the PSU sadly

I have just tried updating the BIOS to the latest version just now without any luck. Should I just return the GPU back? It's been just over an month since I bought it from OC, I'm hoping that there won't be an issue returning it back.

What is strange is that after updating the BIOS, it no longer recognises that there is anything in the PCI Express x16 slot. I also had this with before when I booted up the PC for the first time and after clearing CMOS.

sorry, worked late last night.
the adaptor cable that comes with the gpu isn't meant to reach the psu...you still have to use the cables that come with the psu to connecto to the adaptor that then plugs into the gpu...from thread you said you had 2 spare pcie slots...I's still try that..2 pcie cables of 150w each plus 75 w from the pcie slot the card sits in is still 375w available to the card..more than enough for testing the card works and just running windows
any 100% if you have your old pc there, try and test the 5080 in it. you could always take the mobo out of the case if it doesn't fit and lay it on the mobo box from new build as a test bench so to speak..bit of a ball ache but prob easier/quicker than sending card back
did you install windows on the new pc? (I ran my 9800x3d without a gpu for awhile no problems so at least you have a working pc). I'd still do that then load up the new nvidia drivers etc..you never know, that might help the pc detect theres a gpu plugged in

 

[SamGB]

sorry, worked late last night.
the adaptor cable that comes with the gpu isn't meant to reach the psu...you still have to use the cables that come with the psu to connecto to the adaptor that then plugs into the gpu...from thread you said you had 2 spare pcie slots...I's still try that..2 pcie cables of 150w each plus 75 w from the pcie slot the card sits in is still 375w available to the card..more than enough for testing the card works and just running windows
any 100% if you have your old pc there, try and test the 5080 in it. you could always take the mobo out of the case if it doesn't fit and lay it on the mobo box from new build as a test bench so to speak..bit of a ball ache but prob easier/quicker than sending card back
did you install windows on the new pc? (I ran my 9800x3d without a gpu for awhile no problems so at least you have a working pc). I'd still do that then load up the new nvidia drivers etc..you never know, that might help the pc detect theres a gpu plugged in

Latest update:

I tried the Geforce 5080 in my old computer and used the adaptor cable (that came with GPU) connecting it up with two PCI express power cables and I had the same issue as before. I then tried it with the three PCI express power cables and guess what, it worked and I was able to get a display out from it!!

So I guess that means the issue is with the 12+4 PIN PCI Express cable that I'm using? Or with the PSU itself?

I haven't installed windows yet on my build yet as I've trying various things just to get the 5080 working as it's really bugging me!

 

[SamGB]

Seems like I'm going backwards... I have now reinstalled the GPU in my new build and used the adaptor cable that came with the Asus GeForce RTX 5080 Prime OC and ensured all three sockets from the adaptor are connected up and I'm still getting the same issue of no display being output!!! I have cleared the CMOS as well again without any luck. I'm really struggling to work out what's going on now. I think I'll just have to proceed to install Windows on it and just go from there I guess....

If anyone else has some advice/feedback it would be greatly appreciated. Right now I'm just lost and totally out of ideas

 

[koolpc]

Have you tried installing windows with the onboard GPU first and then try the graphics card? That's what I would do....

 

[Craig_d1]

Latest update:

I tried the Geforce 5080 in my old computer and used the adaptor cable (that came with GPU) connecting it up with two PCI express power cables and I had the same issue as before. I then tried it with the three PCI express power cables and guess what, it worked and I was able to get a display out from it!!

So I guess that means the issue is with the 12+4 PIN PCI Express cable that I'm using? Or with the PSU itself?

I haven't installed windows yet on my build yet as I've trying various things just to get the 5080 working as it's really bugging me!

I'd get your new pc up and running with windows running on the igpu from the 9800x3d. you can load up all the latest nvidia drivers then. The fact the 5080 didn't work in your old pc with the supplied connector from the psu, but works using standard pcie cables and the adaptor that came with the gpu is interesting..what psu was in the old build, or did you use the rm1000e on both?

 

[SamGB]

I'd get your new pc up and running with windows running on the igpu from the 9800x3d. you can load up all the latest nvidia drivers then. The fact the 5080 didn't work in your old pc with the supplied connector from the psu, but works using standard pcie cables and the adaptor that came with the gpu is interesting..what psu was in the old build, or did you use the rm1000e on both?

Latest update, I have installed Windows 11 now on my new PC build and installed all the latest motherboard drivers. I tried downloading the Nvidia graphics card drivers for the Geforce 5080 but unsurprisingly that failed as it couldn't detect an Nvidia graphics card in the system. I was using an old PSU which was the Corsair 850w. Essentially I cannot get this graphics card working in my new PC build, whether that is using the PCI Express 5.0 dedicated cable or using the adaptor cable as you suggested. What are the next steps now? Return the graphics card?