Replaced motherboard and when I started the computer I get no boot screen

I have a HP media  center m7463w. I am running Windows Vista Home Premium. My computer crashed and I replaced the power supply when I restarted I had a blank screen (not even a boot menu option), Therefore I felt that replacing the motherboard was the next thing to try, I put a used
Asus HP Compaq LGA775 motherboard 5188-5465 P5LP-LE
in and still got the same result (by the way I've replaced the motherboard once before and when I restarted I got the error message "No Operating System Found" and all I did was re-install Vista Prem. and had no problem until now.)
The only message I receive is from the monitor telling me no signal detected (DVI or VGA) and the monitor was going into sleep mode. I know that the first thing that comes to mind is that the graphics card is bad. My wife also has a HP Media center m7760n which is basically the same computer also running Windows Vista Home Premium. So I've switched monitors and put my graphics card into her computer and they work fine.
I've tried HP's resetting the BIOS even when you have no picture. I've replaced the CMOS battery after leaving the battery socket empty with nothing attached to the computer for 10 hours. And lastly I have removed and reset the pin in order to clear the CMOS. By the way when the problem first appeared I DID put in my  recovery disc and restart. The CD/DVD drive is working. HELP!!!  

Did the computer technician identify what the issue was in this case?
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