If the cpu is not function wat is the damage

[lanjoe]

the cpu cannot turn on

 

[Emerald]

you probably mean the computer cannot turn on.

reason could be a bad Power Supply, motherboard, CPU, CPU Fan, memory, or video card

but not necessarily in this order

 

[me 1]

More details!
Have you installed something recently (hardware or software), or did it act strange lately? (errors, different sounds)
Does it make a sound or anything, when you try to turn it on?