Good points. Either could have been the problem and I was hoping that one of them was--much simpler/cheaper to fix. I didn't mention in the original post, but I did pull the memory sticks one at a time (it had two 512MB sticks). Barring a sudden failure of both, that wasn't the problem. I also wondered about a PSU failure and checked voltages--they were good, even if the color coding on the wires was weird. AAMOF it's running the new mobo just fine.

Technomage wrote:
I noticed one thing missing in that check: the ram. some of the newer 
machines won't post or even report
an error code anymore (series of beeps or blinking lights). have you 
checked to see if the ram is still good?
was the beep a short single or a long single? was there more than one?

also, the simplest thing that can go wrong is usually a PSU failure (and 
depending on how it goes it *can*
tank the motherboard or the cpu or any peripherals you have connected).


Mark Jarvis wrote:
  
My wife's computer suddenly decided to quit displaying ANYTHING--POST included, 
even after replacing the video card, video cable, and monitor with known good 
ones from my box. I even disconnected ALL peripherals. I ended up with the 
conclusion that the motherboard had gone to the great bit bucket in the sky.

I suspect that it was the motherboard that went, not the processor, but don't 
know for certain. FWIW, while I was checking things out I could hear the initial 
"beep" and the HDs start up.

The CPU was a 2.x Ghz  AMD Athlon 64. If anyone wants the CPU--with or without 
motherboard attached, they're welcome to it. Just come by & get it. I live near 
Central & Glendale in Phoenix, email me off list if interested.

Mark Jarvis
m.jarvis@cox.net
  
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