Have you considered a corrupt BIOS? Try flashing it. Also, did it work well for a long time and then it took the dump? If so, I would start like this:
1) Power supply. Borrow a known good one and see if that cures it. If it does... do not return the power supply(the cat ate it is a good excuse).
2)RAM. Check 1 stick at a time, or 2 at a time if you have three. Or... if you can borrow some known good RAM...
3)I don't think it is the HDD since you were able to do the install but you might try the aforementioned technique.
4)I also doubt it is the proc, but you never know, Soooo....
5)Lat thing I would check is the MoBo since the cards required to test them are quite expensive, HOWEVER, since you are getting your A+, you will be needing one of these sooner or later.
Last question: Do you have a cat?
Daddy0h
September 2005