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PC suddenly doesnt turn on anymore

K

killernerd

Limp Gawd
Joined
Mar 8, 2012
Messages
215
Yesterday Evening the PC shut down correctly as far as i can tell. About an hour ago i tried turning it on but got 0 response. No fans, no post nothing. As if the power button itself is broken. The standby leds on the inside light up normally in any case.

So i did what everyone would do, opened it up and tried using the power button on the motherboard itself but again no response.

Took out the gpu. Nothing.
Took out the ram. Nothing.
Unplugged the 8-pin CPU plug. Nothing.

After all this only the drives are connected so at this point i suspected the psu so i dismantled my brothers pc and connected only the 24 pin mobo and 8 pin CPU connectors.
Still nothing.

And thats where im at right now. From what ive tried it seems like it can only be the mobo or CPU but before i do any stupid expenses i want tour opinions.
So in short:

Asus rampage 4 extreme
I7 3820
16 gig corsair ram
1050 watt corsair psu
AMD HD 7970
1 ssd
3 normal hdds

Shut down normally yesterday afaik.
Wont do anything today. No fans, no CPU cant even make it to post
All motherboard leds are on zo the mobo has power at least
Iets not the ram, gpu or psu

The absolute last thing i van try is to unplug all the drives and see if that helps but i doubt it.

Any more ideas?

PS: sent from ly smartphone zo forgive any spelling errors.
 
Tomorrow im going to try one last thing by removing the CPU. If thats whats causing the problemen the PC should at least power on, right? If even that makes no difference i guess it really is the mobo thats dieing...

Woukd be Disappointing though... An expensive RoG board that brakes after barely more than 3 years of usage.
 
killernerd said:
Tomorrow im going to try one last thing by removing the CPU. If thats whats causing the problemen the PC should at least power on, right? If even that makes no difference i guess it really is the mobo thats dieing...

Woukd be Disappointing though... An expensive RoG board that brakes after barely more than 3 years of usage.
Click to expand...

Unplug all power leads to the motherboard then short the green wire to any black wire on the ATX power plug. That should manually force the PSU to be on. If you've got a molex powered fan around to plug in it'll tell you if it's actually turned on. (alternatively a cheap multimeter would also work)

If that doesn't work then your PSU bit it. If that works than there's a decent chance either your motherboard or CPU bit it. (more likely to be the motherboard, I can't remember the last time I heard about a faulty CPU)
 
unplug all the drives first - including SATA and power cables. I have seen a couple instances of drives dying and causing a no power situation.

I have also seen a few instances where a fan died and caused the same thing.

Unplug absolutely everything from the motherboard including the RAM.

Only have the 24 and 8 pin from the power supply plugged in as well as a known working CPU fan or case fan on the CPU fan header.

If it still doesn't power on, then try taking the CPU out.

You can also try testing the CMOS battery. If it is too low or dead it could cause a no power issue.

If it still doesn't power on after that then it is the motherboard.
 
so as a bit of a status update, I did pretty much everything you guys recommended.

Completely unplugged everything from the psu and hotwired it to turn on (which it did).
disconnected everything from the motherboard (including SATA leads, usb connectors, ...) and even tried to run it outside the case to no avail.

@Cyclone I've had dead CMOS batteries in other systems before and that never caused it to fail, it only caused the internal clock to reset every time the system lost all power (psu switched off or power cable pulled out).

So i took the gamble and bought a new motherboard and a new gpu (that upgraded was needed anyway) and my system works normally again.
In the end the only thing I didn't test was the CMOS battery itself, I did remove it for about half an hour to do a complete reset which didn't help either.
 
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