Dell Dimension 8400 troubleshoot

Recently there was a power surge/spike and the computer was in standby mode. Well, it messed up the HDD, so I replaced it. Now the pc keeps crashing quite often with BSOD and numerous stop errors. I did a memtest and it immediately came up with a red screen full of errors. Using the computer right now and it will go hours maybe even days without crashing. Before I rush out and buy some memory, what other things should I check for or is the memtest concrete enough to buy memory? Pc has two 512mb sticks and I didn't test them individually.

New machine up and running, so now its time to get this piece of junk going.

When I boot the dell it goes to the welcome screen, then goes blank leaving only the pointer, which will move in accordance to the mouse. So power down and bsod IRQL something or rather. It will go to safe mode, but shuts down as soon as I start accessing applications. Right now its idle in safe mode. Not too sure what to do next.

are you american?

i just picked up 2gb of crucial ddr2-667 from newegg for like... $33, and i'm sure that will work in an 8400 because i've done the same upgrade w\ 2 here in the office.

After two new sticks of ram and fresh install of xp, my dell has been resurrected. Yay me!!