New Ryzen PC won’t post - Please help.

VPalermo

VPalermo

VPalermo

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My Intel Raptor Lake system keeps on crashing when gaming so I decided to make the jump to AMD but I’m facing major issues with my new build.

I’m using a Ryzen 7800x3d with an MSI X670E Carbon WiFi. I built the system today but it won’t post. If I press the power button on the PC case the RGB RAM lights up and stays on but the fans in the case don’t power on - nothing happens. There is no error code on the motherboard, the Clear CMOS and BIOS flash buttons light up too which means it’s getting some kind of power.

I’ve tried checking the front panel connector is connected properly several times but it must be or else when I press the power button on the case the RGB RAM wouldn’t start to light up.

I’ve unseated and reseated the CPU power and 24-pin ATX several times but it hasn’t made any difference.

I’ve checked the AIO is connected to the Pump header and the case fans are connected to the Sys fan header. I’ve also ensured both are connected to the PSU via SATA/Molex.

I’ve even tried a different PSU to rule out that it’s not a faulty PSU but this hasn’t worked either, I’m getting the same result where the system won’t post but the RGB RAM lights up.

I’ve tried clearing CMOS and flashing the BIOS but neither has worked.

This leads me to believe either it’s a faulty CPU or more likely a faulty motherboard.

I’m at wits end here. I don’t know what to do. Is there something I may have missed to check?

How do I ascertain whether it’s a faulty motherboard or a bad CPU? I did buy both from the same retailer albeit within a day of eachother.

Any advise you can give me would be very helpful.
 
How long have you left it trying to boot?

I am unsure if this is still the case but it maybe doing the memory training so I would power it on and just leave it for 10/15 mins and see if it then decides to boot.

Have you also installed the latest bios?

Steps below on how to do this

Updating BIOS with Flash BIOS Button, taken from the manual.

1. Please download the latest BIOS file that matches your motherboard model from the MSI® website.
2. Rename the BIOS file to MSI.ROM, and save it to the root of the USB storage device.
3. Connect the power supply to CPU_PWR1 and ATX_PWR1. (No need to install CPU and memory.)
4. Plug the USB storage device that contains the MSI.ROM file into the Flash BIOS Port on the rear I/O panel.
5. Press the Flash BIOS Button to flash BIOS, and the LED starts flashing.6. The LED will be turned off when the process is completed.
 
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Thanks for your reply. I’ve waited maybe 10 mins for it to boot. I did read that AM5 takes a while to boot, I completely forgot about this. I’ll give it a go.

I’ve tried flashing the BIOS already but I don’t think that’s worked.
 
Are you using a dedicated GPU? If so remove this and use the on board IGPU and see if this makes any difference.

May sound strange but what slots do you have your ram currently in?
 
VPalermo said:
I’ve checked the AIO is connected to the Pump header and the case fans are connected to the Sys fan header. I’ve also ensured both are connected to the PSU via SATA/Molex.
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Do you have a fan connected to the CPU fan header?

Not having this can stop a PC from booting, but think you should get a warning on your screen.

What AIO do you have? Maybe you can have the pump connected to the pump header and the fans connected to the CPU fan header.
 
ED209 said:
Are you using a dedicated GPU? If so remove this and use the on board IGPU and see if this makes any difference.

May sound strange but what slots do you have your ram currently in?
Click to expand...
I’ve tried with the dedicated GPU and without, although I haven’t yet tried connecting the HDMI port on the motherboard to a monitor yet, I only tried connecting the HDMI port on the dedicated GPU to a monitor. I’ve also tried booting without the dedicated GPU attached but it makes no difference. The system fans don’t spin, the AIO fans don’t spin, no error code on the motherboard. Only the LED lights on the RGB RAM light up and the LED lights for the BIOS flashback and CMOS light up white on the rear of the motherboards IO panel.

I’ve tried various different RAM slots too but it’s the same result every time.
 
freddie64 said:
Do you have a fan connected to the CPU fan header?

Not having this can stop a PC from booting, but think you should get a warning on your screen.

What AIO do you have? Maybe you can have the pump connected to the pump header and the fans connected to the CPU fan header.
Click to expand...
I connected the AIO to the Pump header. The thing is that nothing comes up on the screen because the PC won’t even post.
 
I also tried unplugging everything and only connecting CPU to PSU, motherboard to PSU and the same thing happens. So I think it’s a faulty motherboard or faulty CPU.
 
Remove the board from the system and test it on top of the motherboard box (do not place an anti-static bag under it!) check the seating of the RAM, and boot with only one module installed in the slot that the manual suggests should be first. Do not have your graphics card installed, and instead use the HMDI/DP on-board. Ensure you have the CPU cooler fan connected. Double check the connections to your PSU if it is fully modular and swap the 8-pin EPS, if it came with two.

When you've got it all sorted sort the Power On pins on the JFP1 header and see what LED's you get on the motherboard. If you get nothing you can try doing a BIOS flashback.
 
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how did it respond when you built the system out of the case first to check all the parts work before comitting to building it inside a case?
I've had this problem before and it turned out to be a rogue extra stand off that I had aciccedentally put in the case, causing a short on the board,
it was confusing the heck out of me, because I had already built it out of the case and it was fine, so then, I lifted tee board out of the case and saw the extra standoff there, removed it, and everything worked!
 
VPalermo said:
I connected the AIO to the Pump header. The thing is that nothing comes up on the screen because the PC won’t even post.
Click to expand...
I should have been more clear. Can you plug the pump into the pump header and the radiator fans into the CPU header?
If it is a single cable for pump and fans, plug it into CPU header.

If you want to try the integrated graphics on the CPU, i think you will have to remove the dedicated GPU and plug the HDMI cable into the motherboard.

I don't think the bios flashback and cmos reset button should be lit all the time.

There is some basic debug LED's just above where you plug the 24 pin cable in, are any of them lit?

Threepwood said:
this cpu itself does not have any pins to bend on it, it's great, just shiny flat contacts
Click to expand...
I think phil-k meant CPU pin on the motherboard.
 
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