Thanks for the quick response blckhaze, and for your assistance. It is much appreciated.
4 240 pin DDR2 DIMM sockets, PC2-6400 (800MHz) memory. I have 2 2gig and 2 1gig pieces.
Power supply in HP computer is Delta Electronics DPS-460DB-1 A Rev 03F HP part# 5188-2862
BUT... since I thought the PS was fried as well, I bought a new Antec Neo ECO 520C Power supply that I will swap in at the same time at the motherboard. 24-pin (20+4) main connector, 4+4 pin ATX/EPS, 8 pin (6+2) PCI-E + 6 pin PCI-E, 6 Molex connectors + Floppy, 6 Serial ATA connectors