Cant get vga signal on asus striker ii extreme gtx 260 550w

[jackalxxx]

hi guys,
i need your input to see what the problem is,
i built a system which has a

core 2 quad q9650 3.0ghz
asus striker ii extreme 790i sli
asus geforce gtx 260 graphics card
550 watt psu
500gb western digital hard drive

my problem is on the 1st boot i cant get a signal to my monitor and the lcd poster goes as far as det ide and then the next message is "error msg"

everything lights up fine and no beeps or anything etc.
also i watched the gtx 260 and its fan never starts up so im wondering is the 550w psu not giving it enough juice to start up hence no vga signal to my monitor

any advice is appreciated guys,
im tearing my hair out all day lol.
hope to hear from you all soon and i can give more info if needed

cheers

 

[shortstuff_mt]

This checklist is the first place to start:

http://www.tomshardware.com/forum/261145-31-build-post-checklist