I did all of this. Nothing works. I took my new & old power supply to the repair shop & was told both work fine & hard drive works fine. I was told it was just the motherboard. Now that I replaced so much to it I can't see what else could be wrong. Luckily everything was cheap. Replacement Motherboard, $20. 2 GB of RAM, $20. New Power Supply, $33.(Returned it) I am absolutely stuck. Unless I can find an easy fix, I plan to just by a new one. Thanks for the help!