Please help with power supply diagnosis

Could be a dead motherboard. You can try a better ps if you have a spare. Ascendtech.us has a dell 2200 board for $14.99 with free shipping. Check the specs carefully to be sure it will work with your cpu and ram.

Hey, thanks for the suggestion and info.! I guess I should have mentioned in my original post that the monitor works perfectly, as does the hard drive, so that narrows it down some. thanks again.

Sounds like the BIOS is Dead. I would junk the system. That system really is not worth fixing. The thing about DELL is the componets they use are not the best. I have owned a few DELL products in the past the Desktops by DELL have never made it to 3 years without dying. The Laptops I've had have been good. I have one that is 8 years old and it still works great.

Thank you for your response--never thought of that! We bought a new Dell desktop at the office about 4 yrs. ago, and it had to have a new motherboard in the first month! On the other hand, I have an Optiplex GX260 at home that still runs like a champ!