Booting issues.

[Frijz]

Earlier today i changed my cooler on my system. After putting it all back together and pressing the on button everything powers up but I get no display on my monitor. Any ideas what could be the problem? I have tried connecting to my video card and the motherboard output.

Could the board of been damaged in some way?

 

[Frijz]

Tried all of the above and still no display on monitor. Not sure whats causing it, I checked the motherboard and there is no sign of damage