Is my CPU or my motherboard dead?

Just to add some info: MB: MSI P55-GD65 CPU: i5 750 Failure due to trying to many volts in overclocking to 4GHZ? Will not POST, no beeps no life, nothing. Checked PSU by plugging into another PC, so that works ok. I don't know whether problem is CPU or M/B. Logically it should be the CPU, but I would... show more Just to add some info:
MB: MSI P55-GD65
CPU: i5 750
Failure due to trying to many volts in overclocking to 4GHZ?
Will not POST, no beeps no life, nothing.
Checked PSU by plugging into another PC, so that works ok.
I don't know whether problem is CPU or M/B. Logically it should be the CPU, but I would have thought that the motherboard would be beep or light up or do something (I tried booting without the CPU present but same result)
If anyone has some sort of idea what the problem is, help is appreciated.

Thanks.
Update: I've done a CMOS reset on the motherboard, and it did nothing.
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