Weird issue: PC “revives” itself after 24h – no power no leds until 24 hours after

Megahackerd

Megahackerd

Megahackerd

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Joined
5 Jun 2013
Posts
412
Hello,

Currently my system refuses to turn on, no sign of life, no leds except when i press the bios flashback button, which then starts up, updates the bios (with the usb) and then shut down.
The dead pc goes on for 24 hours, and then it magically starts working, no signs of anything wrong, passes benchmarks, stress test, works for days, until i need to turn off the power and unplug from the mains to move/work on the computer, then the 24 hour cycle starts up again.

Any ideas of what is wrong?

I have tried 2 different power supplies, both which pass the fan test and work with different computers.

Specs:
Lian Li Vison Chrome
Lian Li Galahad LCD
Montech 1200w, and Lian LI SP850w (just one plugged in at a time)
Amd 7800x3d
Gigabyte B650 GAMING X AX V2 (Rev. 1.x)
32GB GSKILL DDR5
Zotac 4070 Super




I believe the motherboard is faulty, but Gigabyte refuse the RMA as it is an USA motherboard
 
Megahackerd said:
Also reached that conclusion but can't see any visual failures on the capacitors.
Click to expand...
Sometimes you can't there could be a crack inside or some defect not visible.

IM wondering if there's a short somewhere in the case and by moving the case it moves whatever it is inside the case .
 
Last edited:
Really odd this one.
mickyflinn is thinking along the right lines.
Next is to remove the board from the case and test with the minimum hardware. One stick of RAM, no GPU (use the integrated GPU).
 
And try another cmos battery. I had a pc do this years ago and replaced the battery with a new dud. Worked fine after replacing for a 2nd time.
 
mickyflinn said:
Sometimes you can't there could be a crack inside or some defect not visible.

IM wondering if there's a short somewhere in the case and by moving the case it moves whatever it is inside the case .
Click to expand...
yep even moved to a different cases and did test it outside on mobo box but nothing. still the same symptoms

inogen said:
And try another cmos battery. I had a pc do this years ago and replaced the battery with a new dud. Worked fine after replacing for a 2nd time.
Click to expand...
let me go and buy a new cr2032 then, can never have too many of them
 
very minor capacitor bulging or any kind of oil substance on the motherboard would indicate a cap has gone, if you see any of the 2 then the board is bad, possible to fix if you have the skills but if that's caused any further damage to linked components its best to replace your board
 
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