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You either have a dead CPU or a dead motherboard or a partially-dead power-supply -- the power-supply should supply different voltages to different computers, i.e., one voltage to spin fans, and a different voltage to power the RAM, and a different voltage to power the motherboard. So, it can be "partially" dead.
Borrow a power-supply, and try that first.
If all else fails, take the computer to a qualified technician.
When you say power is going to the mobo, are other fans and lights turning on? You also may have forgotten to plug in the large ATX power cord from the PSU, or the smaller 4-pin rectangular 12V power cord. Is the correct local voltage setting for your PSU selected (110 or 220)?
Hi have you cleaned the heatsink?
Also replace the paste on the CPU, also you could try installing an extra fan on the case to increase air flow.
Also check that your RAM is seated properly and any other chip and card on your board is firmly plugged in.
If all this fails replace your CPU.