[Solved] Computer turns on and off.

My computer has been running fine for 2 years but now when it turn it on, it turns off again and again. What could be the problem? It turns on with all the fans running for 10 secs then turns off for a few seconds and repeat.

Things i've added recently was a soundblaster 2zs and I read my 2x1gb ram sticks had to go on the same colour. i had my 2x1 running on different colour slots.

and my sticks are 2.2 and I believe my mobo stock is 1.8 so I bumped it up .4.

could any of those had caused this and if so what could be the damages?

Thanks in advance.

COuld simply be your PSU has aged and is now marginal...

YOu can set your mem clocks to stock, and see if stability returns. check with mem manufacturer to see what voltage is requiired at whatever mem clocks/latencies your are running.

Reference your mb manual to find out which dual channel slots need populated in what order; you might not be able to hit as high a mem clock with dual channel access, but, the system would still likely be faster overall.

'fans running high...'

You are not set for 115VAC (rear of PSU) running off 220v are you?

Im not sure what you mean by that.
my system consists of:

Case- Antec 900
Mobo- Gigabyte P35-DS3R
PSU- COOLER MASTER eXtreme Power RP-600-PCAR 600W ATX from factor 12V V2.01
CPU- Intel Core 2 Quad Q6600 3.0GHZ
RAM- Crucial Ballistix 2gb - 2x1gb PC2-6400 CL4-4-4-12
GPU- Galaxy Geforce 8800gts 512mb (G92)
HDD- Seagate Barracuda 7200.11 500GB Sata2 8.5ms 32mb cache
Sound Blaster Audigy 2zs
LG DVD/CD RW Combo


and T_T, I am 100% the hsf is running. I opened my case and powered it on and all fans are working.

Memtest, 1 stick at a time

http://memtest.org/

Best answer selected by azniza.