No POST, no ARGB either

GeX

GeX

GeX

Soldato
Joined
17 Dec 2002
Posts
6,950
Location
Manchester
I have a system that has been working great since Christmas Day, but this week after letting it sleep - it now won't wake up.

It won't POST. The monitor wakes, and goes back to sleep due to no signal. It cannot be powered off by holding the power button.
The fans spin, but the ARGB on the case fans (and RAM) does not light. There are no debug LEDs, but this board is known for quick memory training and it has been left for plenty long enough for that to happen. Also, ime - when training, the ARGB would be on.

The RGB on the CPU fan is lit up, and I can't remember if I connected that to the mainboard's ARGB or that's just connected via USB.

Cleared the CMOS, checked power connections on the board. I can't think what else to check before stipping it down and testing parts on their own in other systems.

Spec is

Gigabyte B650M GAMING X AX
Ryzen 7950X3D
RX7800 XT
Kingston FURY Beast EXPO RGB 16GB (2x8GB) DDR5 PC5-48000C30 6000MHz
be quiet! SYSTEM POWER 10 750W 80 Plus Bronze

To me, it smells like the mainboard has failed else why isn't the RAM lighting up.

Has anyone seen similar before, and can advise?
 
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It works to power it on, just not off. Which to me is indicative of a hardware problem but I spent more time debugging PCs 20 odd years ago
 
ED209 said:
Have you tried removing the GPU and using the IGPU?

Also tried with 1 stick of ram and removing the other and then swapping over if still no joy?
Click to expand...
Picked the system, and tried this today. Same issue :(
 
Threepwood said:
windows MBR, or BCD is probably messed up, it's unlikely that you will be able to fix that, so just reinstall windows, and turn sleep etc off , first thing that you do, I turn all those settings off when I do a new install, tbh, I just want my computer on when I come back to it, and yeah, sleep is nasty for messing up mbr/BCD.
Click to expand...

Not sure if you read the thread, but it doesn't POST - so I can't just go re-install Windows
 
I'll swap the CPU, and RAM over to another system and see what happens. If that's OK, then I'll swap the PSU over. If that's all fine it confirms the mainboard is kaput I guess

Edit: Swapped the RAM and CPU into another system, and that worked fine. The PSU is a bit more tricky to swap, so I'll probably do that tomorrow.

Edit: Tested with a spare PSU on the bench, and it POST'ed. So.... maybe it's the PSU. I'll take the PSU out of the system and try that on the bench to eliminate shorting in situ.
 
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Just tried the original PSU on the bench, no POST.
Swapped to the known good PSU, POST.

Conclusion, F for the be quiet! SYSTEM POWER 10 750W 80 Plus Bronze
 
ED209 said:
Glad to see you have narrowed down the fault.
Click to expand...
narrowing even further, it's the 3.3v line on the PSU - it's only outputting 2.5v. As it's been a while since I diagnosed this kind of stuff, I checked on the known good PSU and it was showing 3.3v as expected. I did this as it isn't connected to the mainboard, and so I wasn't sure if the PSU was waiting for PWR_OK before fulling powering up (even tho the other lines were active and correct).
 
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