Here are Seven E-Z steps to check the death of your CPU/Mobo...
1- While the whole PC is plugged into an A/C outlet, touch the PSU (power supply) before anything else so as to discharge any static build up you might have on ya.
2- Remove the CPU from the mobo,
3- clean off the thermal cooling paste & reapply about half the size of a grain of rice (I hope you have Arctic Silver (cost is about $9-$11) CPU thermal paste),
4- clean the heat sink on the fan, too.
5- Reseat the CPU & reinstall the CPU fan back on. A quick test is to remove all of the RAM.
6- The system should start beeping if the Mobo is still alive.
7- Good luck...