Strange problem that happens occasionally

[LionKinG88]

Hello,
I've installed my new comp like 1 week ago, everything works fine, its fast as it should.
But the problem seems to be happening while watching a movie, it doesn't always happen, it hasen't happened since 5 days now, but the screen in the movie gets dizzy and abit striped with different colours like a row of different colour lines.
Then my mouse cursor gets abit messed up too after this.
I'm currently running Windows XP Proffessional.
I'm not sure if the PSU can cause this problem, since the PSU doesn't have a 8-pin CPU connector, only a 4pin one, otherwise it still works fine.
Anyone got any idea what could cause this? Note that this has only started after watching a movie, not after playing games/listening to music.

My system:

Mobo: EVGA nForce 750i SLI FTW
CPU: Intel Core 2 Dyo E8400 3.0Ghz (1333MHz 6M S775)
RAM: OCZ DDR2 4GB PC2-6400 GOLD XTC KIT (2x 2GB)
HDD: 2x 200GB 7200RPM
GFX: BFG Nvidia 9800 GTX OC 512Mb
Audio: Creative SoundBlaster Audigy 4 Pro
PSU: OCZ ModStream 520W

 

[LionKinG88]

bump