How can I tell if it is the MOBO or CPU that failed?

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I'm working with HP Pavilion 552x with OS XP. I had to buy a new PSU and it seems to be working fine. But when i start the computer all fans work but nothing else does. It doesn't recognize the monitor, had drive and CD drive or the floppy. It's basically dead! I visibly can't see anything out of sorts with the caps on the mother board a P4S-LA. And I pulled out the CPU to make sure it was set properly. When I turn on the computer I am unable to shut it down by holding the button in for 5 seconds (I held it longer) the only way to shut down is by the button on the PSU. I am dumb founded and in need of some real good help.
 
Any beeps? If not then the mobo was probably damaged by whatever killed the PSU. See it all the time at work.
 
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