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RTX 5080 Won’t boot unless it’s fully power cycled

Jake03

Jake03

Jake03

Associate
Joined
19 Mar 2025
Posts
19
Location
Bristol
Hi. I recently upgraded from a GTX 1080 to a ZOTAC RTX 5080 SOLID.

Specs:

  • MSI Z490 Motherboard (Latest BIOS Update)
  • i7-10700KF
  • NZXT GOLD 1200W PSU (This is brand new and I use the 12pin connector it came with!)
  • ZOTAC RTX 5080
  • 32 GB DDR4 RAM
For some reason the GPU won’t launch unless it’s fully power cycled. (Left for 5 minutes and then turned back on). When this happens I get a screen which says "vbios not supported" -> F1 goes into bios -> boots into windows. When I just try to start it normally it gets to VGA on the motherboard all the fans on the gpu start spinning and then the system powers down, then it turns itself back on and keeps doing this.

And its also worth mentioning it keeps switching between saying there's no graphics output protocol and no VBIOS support.

Things i’ve tried to resolve my issue:
  • Updated BIOS
  • Cleared CMOS
  • Used DUU and reinstalled all the drivers
  • Reseated all the cables multiple times (There's a green light on the gpu to )
  • Disabled Fast boot
  • Forced MOBO to use GEN 3
  • The GTX 1080 works fine in the same PCIE slot so that's fine too!
Any thoughts would be appreciated!!!
 
BS Dave said:
Is this a UEFI/Legacy mode thing? Have you made sure CFM is turned off etc
Click to expand...
When I first turn on the PC, I get an error stating "No Graphics Output Protocol Found, Switching to CFM." I manually change it back to UEFI mode, and the system boots into Windows without issue. However, when I restart the PC, it fails to initialise properly. The system continuously reboots without successfully powering on. If I leave it powered off for several minutes and try again, it eventually turns back on but displays an error such as "VBIOS Not Supported."

It seems as though the system is automatically switching between UEFI and CFM mode on its own. But the main issue is that the PC refuses to get passed VGA and just powers itself off.
 
Jake03 said:
Hi. I recently upgraded from a GTX 1080 to a ZOTAC RTX 5080 SOLID.

Specs:

  • MSI Z490 Motherboard (Latest BIOS Update)
  • i7-10700KF
  • NZXT GOLD 1200W PSU (This is brand new and I use the 12pin connector it came with!)
  • ZOTAC RTX 5080
  • 32 GB DDR4 RAM
For some reason the GPU won’t launch unless it’s fully power cycled. (Left for 5 minutes and then turned back on). When this happens I get a screen which says "vbios not supported" -> F1 goes into bios -> boots into windows. When I just try to start it normally it gets to VGA on the motherboard all the fans on the gpu start spinning and then the system powers down, then it turns itself back on and keeps doing this.

And its also worth mentioning it keeps switching between saying there's no graphics output protocol and no VBIOS support.

Things i’ve tried to resolve my issue:
  • Updated BIOS
  • Cleared CMOS
  • Used DUU and reinstalled all the drivers
  • Reseated all the cables multiple times (There's a green light on the gpu to )
  • Disabled Fast boot
  • Forced MOBO to use GEN 3
  • The GTX 1080 works fine in the same PCIE slot so that's fine too!
Any thoughts would be appreciated!!!
Click to expand...
Hi,

Sounds like its a hardware issue to me.

The RTX 5080 will demand a lot of power. Perhaps more than your 1080 does. My RTX 3070 only required 220 watts, my RX 7900 XT a lot more.

1) Test the GPU in another system and see if it works in that.
2) Replace PSU in PC, with a spare one and see if the boot issue is solved.
3) Try GPU RTX 5080 in alternate PCI-E slot, this may then indicate your motherboard is messed up.
4) On rare occasions, a damaged pin on the CPU or motherboard, may cause issues with GPU. I think this unlikely here, because you boot after five minutes.
5) If nothing works, RMA the sucker. The GPU.

Regards

Von
 
VonScar said:
Hi,

Sounds like its a hardware issue to me.

The RTX 5080 will demand a lot of power. Perhaps more than your 1080 does. My RTX 3070 only required 220 watts, my RX 7900 XT a lot more.

1) Test the GPU in another system and see if it works in that.
2) Replace PSU in PC, with a spare one and see if the boot issue is solved.
3) Try GPU RTX 5080 in alternate PCI-E slot, this may then indicate your motherboard is messed up.
4) On rare occasions, a damaged pin on the CPU or motherboard, may cause issues with GPU. I think this unlikely here, because you boot after five minutes.
5) If nothing works, RMA the sucker. The GPU.

Regards

Von
Click to expand...
Hi thanks for the reply.

1.) Haven’t got anyone to really try it with since i’m at uni.
2.) I’ve just replaced by 800W PSU with this new 1200 one
3.) Since the card is so massive I can’t manage to plug it into my other slot so I can’t try that.

Every time i unplug the power and put it back in it load and I either get no VBIOS detected switching to UEFI. Then it loads to desktop

When it restarts again it says no GOP support detected in this card. Bios CEM/UEFI settings will be changed to CSM. Whenever i run either of these it works and boots to desktop. Then when i restart it it cannot boot.

Think i’m going to just request RMA i don’t know what else I can do.
 
Last edited:
Jake03 said:
Every time i unplug the power and put it back in it load and I either get no VBIOS detected switching to UEFI. Then it loads to desktop

When it restarts again it says no GOP support detected in this card. Bios CEM/UEFI settings will be changed to CSM. Whenever i run either of these it works and boots to desktop. Then when i restart it it cannot boot.
Click to expand...
Do you have anything you care about on the SSDs?

I think it might be worth removing them entirely, connecting a brand new fresh one with nothing on it (or that you don't care about formatting) and ensuring that: CSM is disabled and secure boot is on (for Windows 11 support) and see if it helps, because it does sound more like a motherboard BIOS and/or CSM/UEFI problem than a faulty card. My suspicion is that if you send it back as faulty they will just say it is fine and send it back.
 
Tetras said:
Do you have anything you care about on the SSDs?

I think it might be worth removing them entirely, connecting a brand new fresh one with nothing on it (or that you don't care about formatting) and ensuring that: CSM is disabled and secure boot is on (for Windows 11 support) and see if it helps, because it does sound more like a motherboard BIOS and/or CSM/UEFI problem than a faulty card. My suspicion is that if you send it back as faulty they will just say it is fine and send it back.
Click to expand...
That’s what i’m worried about as well.

I’m going to run Windows 11 creation tool.

Format all the drives and put a fresh copy of windows on and see how that’s goes.

If that’s not the case do you think it’s the Mobo?

Thanks for the reply
 
Sounds like a card issue, it should be straight up plug in and play.

I changed out my RTX 2060 to a Palit 5080, no issues. But I did make sure I forced PCIE Gen 4 in the BIOS before the swap, as I am running a Gen 4 riser cable.
 
Last edited:
Major774 said:
Sounds like a card issue, it should be straight up plug in and play.

I changed out my RTX 2060 to a Palit 5080, no issues. But I did make sure I forced PCIE Gen 4 in the BIOS before the swap, as I am running a Gen 4 riser cable.
Click to expand...
It always loads when i plug it in for the first time. It’s just when I shut the PC down and try to power it back on.

The highest my MOBO can go is Gen 3 since i have a 10-series.
 
Might as well… I think you need to upgrade that platform.

Within this month (March), I have used a GTX 970, 2060 and 5080. All running fine with my AM5 motherboard.
 
Last edited:
Jake03 said:
If that’s not the case do you think it’s the Mobo?
Click to expand...
Hard to say really, these cards are very new so there might be some kind of compatibility issue we're not aware of.

What is the exact model number/name of your motherboard?
 
Last edited:
Jake03 said:
My Mobo:

MPG Z490 GAMING PLUS​

Click to expand...
Hmm.

I can't see any benchmark profiles on here:

There's just one 5000 series, which is with a 5070 Ti and funnily enough, Windows 10:

System Micro-Star MS-7C75
Motherboard MSI MPG Z490 GAMING PLUS (all builds)
Memory 23.1 GB free of 32 GB @ 2.1 GHz
Display 2560 x 1440 - 32 Bit colors
OS Windows 10
BIOS Date 20240708
Uptime 0.9 Days
Run Date Mar 08 '25 at 14:23
Run Duration 145 Seconds
Run User DEU-User
Background CPU 11%
Click to expand...

Completing the benchmark doesn't indicate the works fully though.

You might want to try emailing MSI?
 
Last edited:
Tetras said:
Hmm.

I can't see any benchmark profiles on here:

There's just one 5000 series, which is with a 5070 Ti and funnily enough, Windows 10:



Completing the benchmark doesn't indicate the works fully though.

You might want to try emailing MSI?
Click to expand...
I’ve sent them an email.

I’ll keep you guys posted. Thanks for all the input!

I’ve put in for RMA, if it does work for them and they send it back. I’ve got no choice but to upgrade the mobo and cpu…
 
I think it's a mobo issue
Are you sure there is nobody else at uni with a PC you can try it in?

Try the 800w PSU, it should be fine for a 5080. I was using a 750w with my 4090
 
Last edited:
Jake03 said:
I’ve sent them an email.

I’ll keep you guys posted. Thanks for all the input!

I’ve put in for RMA, if it does work for them and they send it back. I’ve got no choice but to upgrade the mobo and cpu…
Click to expand...
Left field option: what if you purposely installed Windows with CSM enabled and a legacy BIOS instead of using UEFI?

It might fix the boot problem and allow you to continue using the card without upgrading.

Ideal? Maybe not, but cheaper than an upgrade.
 
Last edited:
no_1_dave said:
I think it's a mobo issue
Are you sure there is nobody else at uni with a PC you can try it in?

Try the 800w PSU, it should be fine for a 5080. I was using a 750w with my 4090
Click to expand...
My flatmate doesn't come off league so I have no chance.

I used my old PSU and that didn’t work either. I that’s why i bought the new 1200W one to test?
 
Tetras said:
Left field option: what if you purposely installed Windows with CSM enabled and a legacy BIOS instead of using UEFI?

It might fix the boot problem and allow you to continue using the card without upgrading.

Ideal? Maybe not, but cheaper than an upgrade.
Click to expand...

One minute it switches to CSM automatically. Then it automatically switches to UEFI. Have you got any links for how I would downgrade the bios, would i just flash it with an older version?

I’ve formatted all the drives on the PC and that’s done nish.

It’s just the powering issue. When the powers completely drained and I start it up it always displays either no VBios support or no GOP. After i shutdown the pc it refuses to post and crashes at VGA and just keeps trying to reboot itself.

I’ve looked on Reddit posts and most people that are using a Z490 are just having the black screen issues.

I can use the pc perfectly when it does eventually boot to windows. I just don’t want it to keep rebooting itself and to just detect it properly I suppose.

Do you think it’s worth sending it off tomorrow for RMA?
 
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