Green Screen White Lines Appearing :( *pics*

[Blcfc]

Hi I have an imac and first the screen went green not long after i got the powersupply changed and now lines are appearing, heres a picture of it

....hope someone can tell me what is wrong

 

[Guiyon]

That looks like either a failing graphics chipset or a loose cable between the logicboard and the display. I'd get that in ASAP and get it fixed.