Hi, as you can guess from the title of my entry, I built a computer, but it isn't QUITE working, and I was wondering if anybody can help...

Ok, so, the computer boots up, and then after doing the RAM check and checking for drives, it suddenly crashes and the screen GOES black, and the power lamp REMAINS on for a while after it crashes, and then the whole thing just SHUTS down...

Here's the list of parts:
-Pentium 4 Northwood 2.40BGHz
-FOXCONN 650 motherboard
-Audio and Video card integrated into motherboard
-1x 512MB DDR RAM from KByte
-Case and power from Powmax
-40GB hard drive from Seagate
-DVD R+-W drive from NU
-Floppy drive
-7in1 media reader from iAPPre-check all of the wiring and components>>http://www.buildyourowncomputer.net/learntobuild.html    maybe a faulty board?or cpu not seating properly......thermal paste??Are the RAM chips that you installed new, or are they old (used)?

[glb]Flame[/glb]Thanks guys =D Well, the RAM was new, but I didn't have thermal paste....
I tried using another hard drive, and that got me into Windows, but then the computer crashed soon after, so this time I tried the thermal paste.... And well, it's up and running (For now, at least... It hasn't crashed for 8 hours, so I'm assuming it's fine), so thanks for the advice!