PC Turns on then Instantly Shuts Off

[seeARMS]

Hey all,

I've been having a very strange problem lately: When I press the power button on my PC, the fans spin, the lights turn on, then half a second later it shuts off. About 5 seconds later, this process repeats, until I flick the PSU switch.

Recently I moved my PC from one room to another. After I moved it, I didn't use it for about a week or so. When I tried to turn it on after the week, I started getting this problem.

I have an Asus P6T, a Core i7 920, a Radeon HD 4670, a 650W Ultra PSU, and 6GB of DDR3 RAM.
I've gone through a ton of steps to troubleshoot:

1. I've removed the motherboard from the case and installed it on a piece of cardboard.
2. I've tested the computer without the RAM, harddrive, DVD drives, etc. Only the CPU. I still get the same result.
3. I've used a different PSU.
4. I've tried different power outlets.
5. I've reseated the video card, the CPU, and the RAM.

Nothing seems to be working!
Any help is appreciated.

Thanks.

 

[jsc]

Our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-posting-boot-problems

 

[seeARMS]

Ah, I have actually followed those, but I forgot to mention it in my thread.

I got the breadboarding idea from one of your posts.

 

[seeARMS]

Hmmm, I'm most likely going to RMA the motherboard.. I'm not sure what else to do :/

 

[Guest]

My computer started randomly switching off the second i turned it on last night aswell
Just want to put in my solution that worked for me, i spent about 3 hours taking my computer to pieces and then back together again, put new heat sink, tried different psu's and different power buttons.. my only option was to buy a new motherboard.. however i noticed a lithium battery on the motherboard (im not a computer wiz with hardware) so i popped it out to check it and it had a tiny tiny bit of dust on it, gave it a blow and popped it back in and viola.. computer works and i just saved myself £100~

Check lithium battery on motherboard