Yesterday I bought a used eMachine T5254 to replace my dad's old Dell. When I first booted it up, everything worked great. I even had to switch outlets at one point and it restarted just fine. I left it on for hours until I was ready to install Windows 7. After putting the DVD in and restarting the computer, nothing happened and it just started beeping. At first there were 4 beeps, a pause, and then continuous beeps. So far I have tried reseating the RAM and CMOS battery. I feel like it's something very simple to fix, but I just can't pinpoint it. The fan on the motherboard looks pretty dusty, but I don't know if that would be the cause of it to quit working so suddenly. I'm hoping someone out there has some experience with this issue. Thanks for any help!