How to verify CPU functionality?

[DCU1976]

My friend has an older PIII setup that will not boot, we tried another CPU in the motherboard but it too does not boot. Is there a definative way to verify if the processor is faulty or the motherboard? When power is supplied there is no beep, fans spin but no CMOS beep. Thanks!

 

[Blain]

If you tried another CPU and it did the same thing, why question the original CPU?
I would assume it was the memory or MB, possibly the PS (fans spinning doesn't always mean the PS is working correcly).