Processor problems

Hello,
I installed a new processor in my computer and when i booted up, nothing appeared on my monitor. I asked a friend of mine to put it in his computer and the same thing happened so I sent it back and had it replaced. When I got the new one I put it in and the same thing happened. My computer is a Gateway and currently has a pentium 4 2.00 ghz processor and the one I am trying to put in is pentium 4 3.00 ghz. Why is the system not booting?

Thanks,
Cushmanus