hard drive failure may be a remote chance as being the culprit. it's usually easy to tell ... when they fail, they may click or make a grinding noise. you can pick it up and listen to it and if it's not making noise, that'd be your problem.
usually that would be a mobo, GPU/CPU, vid card, or [remotely] possibly, RAM problem.
you haven't mentioned that you cleared the cmos, jbrist.
turn the whole thing off. de-static yourself (take off your socks, touch something metal). unplug. pull out the lithium battery in the mobo. let the battery stay out of the computer for like 7-10 minutes.
you're going to find a little cmos jumper prong-thingy somewhere near the lithium battery on your motherboard.
looks like: http://www.nordichardware.com/skrivelse ... 2/cmos.jpg
it will have a little cap over 1 & 2.
So: (X= covered by cap; O = uncovered prong)
Pick up the little cap and put it over 2 & 3:
Put the battery back in.
(Having the battery out usually is all you need but this is just to be on the safe side.)
Plug everything in and turn it on. If you can get to the BIOS, reset to the default settings and save & exit. Turn off the computer (entirely--using the switch in the back, or unplug).
Move the cap back to 1&2:
Then turn it back on. It should work.
It's a good idea to do this when you change out video cards or RAM sticks etc.
If it's still not working:
- There may be a wire needing to be connected to the mobo from the vid card, in addition to the PCI slot. Have you checked?
- If the monitor comes on but it doesnt complete the POST, your hard drive is malfunctioning.
- Try unplugging all peripherals (mouse, keyboard, audio, etc.). I once had a keyboard that shorted and did that same thing. You can also try unplugging the CD/DVD drives, resetting the CMOS, tell the BIOS not to check those drives, then see if your OS starts.
- Try different RAM sticks, purge the CMOS, and see if it posts.
- VERY remote chance here, but it could also be that your power supply is starting to die out and isn't supplying enough juice. Again, pretty remote.
If none of that works ... IDK!