New psu/gpu need help no display

[piggleh]

I just received my 500w evga psu for my pc and i have a asus radeon 7770 2gb hd gpu and when i power on the pc the power button isnt lit up and the keyboard doesnt light up but the mouse does and theres no display no beeps nothing need help

 

[ThomasLeong]

Here is an excellent checklist -
http://www.tomshardware.co.uk/forum/261145-31-perform-steps-posting-post-boot-video-problems