PC won't power on after shutdown

Digitalle

Digitalle

Digitalle

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Joined
22 Jul 2009
Posts
940
Location
London. Glasgow.
4670k
Asus Gene VI
Seasonic G 550W Gold
HD 7970Ghz

I was playing about with my overclock last, as I tend to do, and I think I may have pushed it a little far on the v-core. I've had it stable at 4.2 @ 1.3v (I know it got an absolute terrible chip) for a year-ish now and thought I'd try get just a little more out it, in preparation for my new 970's coming today. Think i had bumped it up to 1.32 to try and get 4.3/4.4.

Saved the setting and restart and it just didn't boot. all the power LED's are on on the mobo but no reaction from the chassis power button/the start button on the mobo itself. The only way I can get it to boot is by removing the power cord and leaving it for 10 minutes, it will then start up fine first time, but after one shutdown the same issue. No boot.

What have I fried?

I had also just installed and upgraded the firmware on my H100i, the only other recent change at the time.
 
Yeah, reset it using the quick reset button on the back. No change. Then removed the battery itself for half an hour or so. Same issue. Going to buy another battery today and try just to make sure.
 
Unless the system is reseting by itself, the replacing the battery would make any difference. If the battery was dead, you'd still be able to boot albeit as default settings and you'd get a message also.


Have you tried booting the PC by shorting the 2 power pins on the motherboard, i.e. by passing the chassis power on switch.
 
I haven't tried this. The motherboard its self has it's own start-up button:

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which I still get no response from. I will try it though.
 
Ok, that's a handy feature i don't have. Anyway, check that both 24pin ATX and 4/8pin CPU power connectors are secure? Try re-seating them anyway.

Has anything become dislodged, causing a short anywhere? under the motherboard?

My only other suggestion is to run a PSU check.. Have a browse through my PSU guide here..
http://forums.overclockers.co.uk/showpost.php?p=19335172&postcount=3

If the PSU works and is supplying the correct voltages, then it's looking more like a motherboard issue, but you'll have to completely eliminate the PSU first.

If you get that far, I'd take the motherboard out of the chassis with the PSU. Disconnect all of the RAM, video card everything. Hook up the PSU and a POST speaker (if you get LEDS even better). So it's just PSU, CPU/HSF and mobo only. Switch on.. You'll get error codes from the POST which is a good sign. If you don't get any errors at this point and you've checked the PSU then I'm sure it's the mobo.

If you get error codes, add back each of the component one by one and restest..
 
Hi there, so I had a busy night last night as you might expect so I'll try and be as brief as I can-

  • Completely disassembled the PC
  • Tested the PSU as per your link with my multimeter and everything seemed to be reading fine
  • Replaced the BIOS battery just incase
  • I then hooked up the PSU to the motherboard and updated the BIOS using that handy USB BIOS Flashback feature on the ROG boards
  • Booted with just the psu, mobo and CPU cooler attached. Booted fine. Ran the standard set up to default bios settings and restarted.
  • It booted into windows as normal. (note than I was using a spare ssd I have with a fresh copy of windows, so no programs/drivers etc)
  • Did multiple restarts and shutdown combos, all was performing as I would expect.

That's how it was left. None the wiser as to the problem. Tonight I'm just going to slowly add my components etc. one by one and keep testing. Hopefully find the root of the problem.
 
I had the same problem with an Asus Deluxe Z97. worked perfectly with a rebuild outside the case. The problem was the detached 4 pin of the 24 pin connector was not perfectly aligned in the socket. Careful fitting in the case cured it.
 
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