Question PRO Z690-A - Running Fine for years - Now wont boot - PLEASE HELP

[DXVIDM]

Hi all,

PC specs:
MOBO: PRO Z690-A
CPU: 13600k
GPU: AMD 7900XTX
PSU: Enermax Revolution D.F

So my PC has been working fine for years, no issues etc. Today I wake up and go to turn it on, it boots for a couple seconds (doesnt display anything to monitor) then shuts off.
I try to turn it on again and the power button does literally nothing, no LED, no Fans, nothing.
So I strip the PC to find out the culprit and test the PSU on its own with the paperclip trick and it works just fine. Then plug PSU into mobo with 1 stick of 16gb ram and it then boots, fans spinning and LED working, but on the motherboard there is a red light under the "CPU" debug section. Now the PC isn't boot looping just staying on with the Red CPU Light on, so I decide to plug in the GPU to see if anything is being shown on screen and nope, GPU gets power too (leds come on) but still the red cpu light and "No signal" on monitor.
So I read a little online and people said it could be updated bios needed? But surely my PC wouldnt just stop working when I have working BIOS in it? I haven't tried new BIOS but could this be the issue?

Ive also took out the CPU and checked pins on board and they are all good, re-applied some thermal paste too and still the exact same issue.


Help me pls!

 

[Darkbreeze]

BIOS wouldn't cause that. Just because the PSU will "power on" doesn't mean it's working properly. This is almost certainly a PSU or motherboard issue but it's definitely possible for it to be a CPU problem since there were some known issues with the 13th and 14th Gen Intel processors due to incorrect operating voltage.

https://www.reddit.com/r/intel/comments/1egthzw/megathread_for_intel_core_13th_14th_gen_cpu/

What is the EXACT model of that Enermax Revolution D.F (D.F12, 850w, actual model listed on the specifications label) and how long has it been in service?

 

[DXVIDM]

BIOS wouldn't cause that. Just because the PSU will "power on" doesn't mean it's working properly. This is almost certainly a PSU or motherboard issue but it's definitely possible for it to be a CPU problem since there were some known issues with the 13th and 14th Gen Intel processors due to incorrect operating voltage.

https://www.reddit.com/r/intel/comments/1egthzw/megathread_for_intel_core_13th_14th_gen_cpu/

What is the EXACT model of that Enermax Revolution D.F (D.F12, 850w, actual model listed on the specifications label) and how long has it been in service?

Enerma Revolution D.F
Model: ERF850EWT
Been used for about 2 years now.

And the PSU doesnt just "power on", ive plugged into mobo and it powers on the mobo/ gpu/ fans etc. So I assume the PSU should still be okay if its powering everything?

And would the CPU red light be on the motherboard if the PSU was the issue? Im so lost :/

 

[geofelt]

Is the motherboard bios current?
Have you overclocked?
Or, have you specified something like load "optimized defaults" ?
13/14 gen intel processors had some issues that caused damage via overvolting.
I suspect that may be your problem.
The good news is that you may be covered by the extended warranty.

I recently had an issue with a i9-12900K and started a RMA with Intel.
Actually, a nice process but it will take time.
They will work you through the process to eliminate other causes of failure.
The best way to document the failure is to replace the cpu.
I replaced with a 13100 processor which worked.

 

[Darkbreeze]

So I assume the PSU should still be okay if its powering everything?

I would not assume that, or anything. PSU can fail in dozens of different ways. Even just specific outputs can fail while other outputs remain working fine. For example, 12v output on the 24 pin ATX cable could be totally fine while 12v output on the 4+4 EPS/CPU cable might not work at all. And that's just one possible partial failure. Could also have low output, but still enough to power up low demand things like fans and LED lights. Are you 100% sure the model of that unit isn't ERF850EWT rather than ERF850WT? Either way, I'm with you on it being less likely to be the PSU since there IS output and since I believe this is a fairly decent model.

One thing I'd probably try before going any further though is removing the graphics card completely from the board and then move your display cable to the output on your motherboard. If it's a weak power supply then removing the graphics card might make a difference. Again, it's not the most probable issue but since you'll have to remove the graphics card if you end up having to remove the board anyhow, it's probably worth the time to at least try it.

Had you ever updated the BIOS previously since AFTER the voltage issues with the 13th/14th Gen CPUs became widely known? If not, then there is a very real chance this could be down to damage from the incorrect voltage over a period of time. It is at least a possibility.

 

[DXVIDM]

Is the motherboard bios current?
Have you overclocked?
Or, have you specified something like load "optimized defaults" ?
13/14 gen intel processors had some issues that caused damage via overvolting.
I suspect that may be your problem.
The good news is that you may be covered by the extended warranty.

I recently had an issue with a i9-12900K and started a RMA with Intel.
Actually, a nice process but it will take time.
They will work you through the process to eliminate other causes of failure.
The best way to document the failure is to replace the cpu.
I replaced with a 13100 processor which worked.

Hey, thanks for the reply!
No I wouldnt have updated BIOS since I got the mobo like 2 years ago
Ive not overclocked or undervolted anything with the CPU, I left as-is and not too sure about the optimized defaults or what that is?

Damn, so you reckon it could literally be the CPU crashed out? The only real way to test that would be to try a different CPU in the system right?

 

[Darkbreeze]

Yes, trying a different CPU or sending it to Intel for them to test it. Or potentially even just removing the CPU and taking it to any reputable PC repair shop and having them test it.

 

[Richj444]

Hi all,

PC specs:
MOBO: PRO Z690-A
CPU: 13600k
GPU: AMD 7900XTX
PSU: Enermax Revolution D.F

So my PC has been working fine for years, no issues etc. Today I wake up and go to turn it on, it boots for a couple seconds (doesnt display anything to monitor) then shuts off.
I try to turn it on again and the power button does literally nothing, no LED, no Fans, nothing.
So I strip the PC to find out the culprit and test the PSU on its own with the paperclip trick and it works just fine. Then plug PSU into mobo with 1 stick of 16gb ram and it then boots, fans spinning and LED working, but on the motherboard there is a red light under the "CPU" debug section. Now the PC isn't boot looping just staying on with the Red CPU Light on, so I decide to plug in the GPU to see if anything is being shown on screen and nope, GPU gets power too (leds come on) but still the red cpu light and "No signal" on monitor.
So I read a little online and people said it could be updated bios needed? But surely my PC wouldnt just stop working when I have working BIOS in it? I haven't tried new BIOS but could this be the issue?

Ive also took out the CPU and checked pins on board and they are all good, re-applied some thermal paste too and still the exact same issue.


Help me pls!

The red CPU debug light doesn't necessarily mean the CPU is bad, it is just the first step in the board's self check. It can and often does indicate a problem with the PSU, but there's no PSU debug light so it stops on the first light of the routine, which is the CPU. Or it could be the motherboard itself or the CPU, but it's easy to check the PSU first.

If you can get your hands on a known good, decent quality PSU (even borrow one maybe?) it's pretty simple to just disconnect your old one and connect the test PSU to check. You don't need to remove the old PSU from the case even, just disconnect the leads from the motherboard.

 

[Darkbreeze]

View: https://www.youtube.com/watch?v=ac7YMUcMjbw