My computer doesn't turn on

[Timiderpear]

I've replace my motherboard and my PSU. My computer doesn't even turn on even for a second. Any suggestions of what is could be?

 

[Grobe]

Check the power switch at the rear end of the psu.

 

[ss202sl]

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems