Generally if the CPU is toast the fans and drives will still spin up (in my experience anyways) so as has been put forward it looks to be the Motherboard or PSU, and again, if you are getting ...

Is It Possible to Test a PC PSU Without the Motherboard?. Troubleshooting computer power issues can be difficult, as the problem could originate with the power supply unit, or PSU, or the motherboard.

' CPU-Z ' is a standard application that allows you to check the CPU name and clock speed. In fact, CPU-Z can not only check CPU information, but also motherboard and memory information, and ...