Desktop computer won't turn on. Lights on motherboard lights up.

[Novice2014]

My desktop won't turn on. The light on the motherboard is on. However, the fan does not work. Prior to this I have not turned this computer on for a couple of months. It was working fine before. I don't know much about computers and am at a loss as to where to begin. Any help would be appreciated.

 

[Computer__GUY]

Mhm... Could be a problem with the processor. If the motherboard light is on, that indicates that both the PSU and the board work.