System freezes ?weird?

[PC-HAngover]

OK I just got finished putting together my SFF system:

Athlon 64 3200+ Winchester (From my old system)
1 GB Corsair XMS Pro Series PC4000 DDR (From old system)
ECS RS480-M V1.0 mATX mobo
XFX 6800 Ultra PCI-E
200 GB Maxtor SATA HDD
160 GB Maxtor SATA HDD
74 GB Western Digital Raptor SATA HDD
Aspire X-QPack SFF case
Antec NeoPower 480 Watt modular PSU (old)
ZALMAN CNPS7000B-ALCU

Ok.. So whenever I am playing a game for about 5 minutes the system freezes and I have to shut it down. I already tried to reseat the cpu cooler twice because I thought it was a heat issue, but I guess not. Any ideas?

I mean it doesn't make any strange noises like the hard drive failed or anything, and I also thought about the video card. But if it was overheating I should be able to see at least a few abnormalities on the screen whenever it freezes, but there is nothing.

 

[upriverpaddler]

What game are you playing? Is it safe to assume that you have done all of your windows updates? Video drivers updates? Bios update?

 

[PC-HAngover]

Yep, I updated everything. Funny thing was that last night I ran HL2, Far Cry, GTA: San Andreas, Q3, Ut2k4 just fine. The game I was playing whenever it did this was BF2, but it had never done it before. So I decided to try to run BF2 again last night... it worked perfectly. I am at a loss now. I didn't change anything since the last time it froze... its weird!