Computer wont start up

[Abob]

well its starts up after a bit of power button spamage and once its on it stays on just fine doesn't crash or anything =/

Spoiler: show

Processor : Intel Core™2 Duo Processor E6700 2.66GHz w/ 4MB Cache
Motherboards : Asus P5B-E w/ DualDDR2 800, 7.1 Audio, Gigabit Lan, SATA II, PCI-E x16
Memory : OCZ 2GB PC2-6400 Gold Gamer eXtreme XTC Edition Dual Channel DDR2 Kit (2 x 1GB)
Hard Drives 1 : Seagate 500GB Barracuda 7200.10 SATA II w/ NCQ, 16MB Cache
Video Cards : NVIDIA GeForce 8800 GTX
powersupply: mushkin 550W

when I bought it

what I have added:

Harddrive x2 seagate 750GB + seagate 1TB
2 more sticks of the same ram (second isnt working atm and it takes too long to restart so I dont bother fixing it)
and thats about it =/

thanks for the help =(

[Lordwafik]

It's some crap with Asus P5X-E motherboards. I have this problem and don't know how to fix it

If anyone says "hurr durr it's the power supply" it so isn't, I changed mine from 450w to 750w and same thing.

[Abob]

bah =/ thanks for the help

[Mansin]

I had this problem too. Turn off your power supply, then a split second after turning it on, press the power button.
Tell me if that works.

[Shuemue]

Wafik just because it wasn't your PSU doesn't mean it won't be his. It could easily be any of PSU, power connectors on motherboard, power switch on the case front panel, etc

[Abob]

so it turned out to be the powersupply, I replaced it and now im getting really low fps in everything any ideas? new powersupply is a corsair 550w. specs are in OP.