Powercolor HD Radeon 7970 GLITCHING :(

So I haven't tried re-seating the cooler but for some reason my GPU keeps making horizontal lines on my computer screen.  Then after a while, everything goes purple... how can I fix this? Nothing on my board looks burnt or broken?

 

Thanks guys. 

 

Could be your monitor. Have you tried it on a different one?

 

Are you on DIV, HDMI, or VGA?

 

dvi with a dvi to vga adapter