cpu is on, but it does not work?

The fan runs rapidly, but my cpu won't work. I can charge my phone with no problem. My uncle was replacing the switches at the house, so he turned off all the electricity while the computer was running. When I try to turn it back on, the cpu runs, the light in front of the power button would not light up.

Jack2015-06-09T15:56:13Z

Hmmm are you sure it is the cpu? If you take your computer to currys they can test it.