Faulty Mobo/CPU

I bought computer parts for a friend (don't get any ideas; he provided the money) in order to build him a new computer. However, during the building process, we realized that either the motherboard or the processor is faulty. Now, I have no way of knowing which of these parts is faulty, as I don't have any other compatible Mobo/CPU parts. Intel won't let me return the CPU until I have tested it, though I can ship the Mobo back to Newegg whenever I need to.

My questions are:

1) Should I ship the mobo back now, or wait to test it or the CPU?

2) How can I test the Mobo/CPU? The Intel CSR guy said I could take it to a computer store to get it tested, but like an idiot, he couldn't provide any specifics. I don't know what to do.

3) If needed, should I just lie to Intel that I tested it and ship back the CPU anyway?


Here are the items I bought:
Intel Pentium 4 511 533MHz FSB LGA 775 EM64T Processor - Retail
BIOSTAR PT880 Pro-A7C ATX Intel Motherboard - Retail

Jam it back in, in the dark.

Originally Posted by Cetra

Finally, be sure you are plugging in the 4 pin ATX12V plug into the motherboard. I can't tell you how many times I've come across this being the problem when others have suspected a faulty P4 CPU or motherboard.

The aux power one, right? Yeah, I have that hooked in. I already made sure to do this since I ran into this issue when I was putting together my own PC last year (though I resolved it in a timely fashion).

Anyway, thanks for the input, Cetra!

There's nowhere I can't reach.