Communities help please

[Jleo]

Guys this is screwin' my head. I get constant black flashes whilst doing anything. I overclock avidly, and most recent addition to my Oc arsenal is 2 stix of pc28000 Ballistix 1024MB. Vieiws and experience welcome. Spec in sig.

 

[Cyber-Mav]

black flashes? what gfx card?

BSOD's would be usually memory related, but black flashes iv had before with a dodgey gfx card.

 

[Jleo]

My graphics card is the Nvidia 7900GT which was over clocked but even when the overclock is neutralised I'm still getting to black flashes.

Not getting bsods just continuos flashes to a black screen, I have the left the setup in off status for a night to see if heat is an issue and as I reply to you the screen hasn't flashed at all, I may have to purchase an El cheapo pci-e card for testing, thanks for your reply it gives me a decent pointer to the cause.