PC shuts off, refuses to boot (BIOS it stays powered on)

ViciousClone

ViciousClone

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Nothing new was installed, or moved, or even bumped

I was watching a youtube vid, right after playing a game, when the pc just shuts down.

Pressing the power button resulted in 1sec boot and off again, started removing one piece of hardware at a time, swapped ram etc

Nothing

Cleaned the AIO cpu cooler, thinking it’s overheating, nothing. New thermal paste as well.

Then for the laughs pressed the power button, and it booted just fine. 4 minutes in it does on me again. But I can reach the BIOS (and stay there) and it never turns off, checking temps, volts, everything is in range.

I’ve even tried another plug and cord.

My gut feel says psu cant take the load?

12700k
Z790 mboard
DDR5 32GB
RTX 3080
750 gold Thermaltake psu
 
Reading a bit
12700k
Rtx 3080 on a 750w is pushing it, by how much I don’t know.

There was a odd issue recently, when the monitors go into stand by mode, if im not using the system after 15mins, the system would be off, checking log files show an unexpected occurrence (no ****, power disappeared)
 
Left it unplugged through the night

Powered om, quickly copied my data over to a back up ssd

Checked the event viewer, but the only errors that stood out was kernel - unexpected power instance (can’t remember the name)

Several of them of course on the time the pc shuts off
 
just replace the psu ,the cpu,the ram,the Gc ,the hdd and the thing that goes ping and you should be fine ,seriously if its the psu then guaranteed something else may have been damaged further down the line if sensitive data toss it .get a cheap psu to test it with ,one of my Dell units had a similar problem over Dec ,hdd also got damaged the psu was faulty .
 
Last edited:
It's power, the gpu and cpu combined would be 600w
 
How old is that PSU? I assume you have removed the GPU and tries to start it?
 
Check the 12v rail on the PSU

I had a similar issue; 12v was drooping to the point of the GPU turning off after a few minutes of running, but the rest of the PC was still fine.

I had to use a multimeter to check one of the rails
 
So it seems it’s the mother of boards

Tested a different cpu and power supply (700w)

While using my machines 750w the rig came on, it was fine so we ran a bench test for 20mins to stress everything

With everything maxed out, the pc was pulling 533w at the plug

I5 12th tested, psu swapped and headers removed
Gpu removed, same.

The only culprit left was the motherboard (gigabyte)

He did have a good point, George and Mossel Bay have insane humidity levels, last 2 weeks it’s been even worse

It seems like something is shorting out
 
ViciousClone said:
So it seems it’s the mother of boards

Tested a different cpu and power supply (700w)

While using my machines 750w the rig came on, it was fine so we ran a bench test for 20mins to stress everything

With everything maxed out, the pc was pulling 533w at the plug

I5 12th tested, psu swapped and headers removed
Gpu removed, same.

The only culprit left was the motherboard (gigabyte)

He did have a good point, George and Mossel Bay have insane humidity levels, last 2 weeks it’s been even worse

It seems like something is shorting out
Click to expand...
First thing I normally do is taking out the CMOS battery for about 30mins or even replacing it. If that does not work then go to the next steps.
 
Dan C said:
First thing I normally do is taking out the CMOS battery for about 30mins or even replacing it. If that does not work then go to the next steps.
Click to expand...
Removed it for 2mins only
Will try 30mins

Motherboard is outside the case now, will remove it before testing further

Flashed the bios a few weeks back, so might revert to the original version again
 
ViciousClone said:
Removed it for 2mins only
Will try 30mins

Motherboard is outside the case now, will remove it before testing further

Flashed the bios a few weeks back, so might revert to the original version again
Click to expand...
No change
I removed everything and just kept the motherboard with a psu hooked up, same effect 0.5 sec boot and instantly powered off
It's looking like this Mboard might just be dead, it has a warranty left, luckily, so i'll have to send it in for RMA
 
A side question

Motherboard wizards where are thou

I’ve always went Z series boards, without overclocking EVER, undervolting yes, xmp profile yes. But that’s about my needs from the board

That bring me to the next point

I have 2x NVME’s and 2x SATA drives, and a RTX3080

Would a B760 do the job as well? Without any bottlenecking, or is a Z690/790 still the right choice

I was just thinking about the pcie lanes the models provide and if a decent B760 board would have done the same jobs and performance delivery
 
ViciousClone said:
A side question

Motherboard wizards where are thou

I’ve always went Z series boards, without overclocking EVER, undervolting yes, xmp profile yes. But that’s about my needs from the board

That bring me to the next point

I have 2x NVME’s and 2x SATA drives, and a RTX3080

Would a B760 do the job as well? Without any bottlenecking, or is a Z690/790 still the right choice

I was just thinking about the pcie lanes the models provide and if a decent B760 board would have done the same jobs and performance delivery
Click to expand...
Check if the B760 supports 2 nvmes and doesn't pillage sata ports, I know B450s do that :-(
 
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