Computer turns off after a few seconds from the startup

[Pirotech]

All started when the blackout happened suddenly in my house.
Before this, my computer had been working permanently for at least a month, there were a lot of services on it like cvs and tomcat. When I tried to turn in on, it began to start up, worked about 5 seconds then turned off again.
I tried to remove all "extra" hardware including RAM, HDDs, *-ROMs, i.e. I leave only my mobo, CPU and the CPU cooler. Try to start up - the same again.
Tried to clear BIOS via jumpers setting and mobo battery removing. Didn?t help.
Tried to change the power supply - the same effect.
After this rolled all back and in blank despair tried to turn the computer on 'just in case'. And 'Oh, God' it got work!
I set BIOS, all worked fine, system loaded, etc..

Two weeks left. The computer was turned on permanently.
I try to plug in my new drive that I bought yesterday. Certainly, I'm forced to turn off the computer for it.
After he drive installation when trying to startup, the same problem that was two weeks ago!
Two hours of all components moving and replacing, of power supply changing and about 100 tries to turn the computer on. And on the 101 time it starts up normally without any reason! All seems to be stable: I can turn it off and on again and it works. Then I gather all the components together, screw a nut tight, put the lid down, turn the power on, go to BIOS and set it - not any new, just restore all my setting, restart, 5 seconds and it turns off AGAIN!

3 hours more, the same operations like changing and replacing and moving, cleaning of all components, then suddenly begin to work again with no reason. This time, set the time only in BIOS, don't plug the new drive in, start up the computer, all work.

My assumption is the motherboard. But what can I do? If I come to a service center and it work there, what shall I say and how to demonstrate the problem? If I even can't repeat it!
Have already googled and haven't find anything similar.
Maybe I should try to burn the BIOS? Haven't done it before.
Didn't see swollen capacitors on the motherboard, no overclocking.

Mobo: ASUS M2NPV-VM socket AM2, integral GeForce 6150
CPU: AMD 64 X2 3800+
RAM: DDRII 800 kingmax 2x1GB

 

[Pirotech]

bump

 

[solas989]

I had a very similiar issue with my Asus M2N-SLI Deluxe. Yes it was the motherboard as it was VERY finiky about the RAM. Resolution, buy (borrow) crappy DDR2 667 (512MB) stick, just one. Flash bios to current one (or one greater than yours). Once the bios was flashed, I put in my two 1GB sticks and was working just fine and could boot without issue (for the most part). Make sure if you buy the ram , you can return it.

I dont know if this will solve your issue or not, but it is documented on Asus website user forums, if the server does not timeout on you. Check under the M2N-SLI deluxe. It happens alot because of the timings and format of the RAM, maybe.

Good Luck

 

[Pirotech]

Thanks for your answers. I contacted the ASUS official support and they assume there is a micro break in the motherboard. I went to the service center and specs came to the same agreement although the motherboard worked on their tests! But when they tried to turn it on together with my CPU, it didn't want to start again. But it couldn't be a compatibility problem because it had been already worked for about six month. So they decided it was the mom and replaced it. And it works for me now. Thanks to everybody.

 

[lightfoot3b]

This is almost exactly what is happening to me. If I pull the axillary 12v power plug the board stays on. I have never gotten it to boot though.