My Central Processing Unit or Processor is down

Please help me solve my problem. My processor is down. Earlier today, I used my computer to play CD. After that, I just log on to my facebook and then shutdown my computer after using it. Few hours after using my computer, I decided to turn it on to do something on the net but It won't turn on. No light, no fan, nothing! I can turn on my monitor but not the CPU. I checked all the wires, sockets, etc.. if they are connected to my CPU and they are all okay. I have not done anything wrong. Please let me know if someone already experienced something like this. I want to know the reason why it happened and what do I have to do to solve my problem. Thank a lot.
Glenn
