Display leaves green and purple lines

Guys
My display leaves green and purple lines when ever I move any windows. I have zapped the PRAM and tested the RAM with memtest. Any ideas as it's driving my crazy

AHT does test the video RAM, so louie's advice is spot-on. If the test doesn't report any VRAM problems and an external display doesn't show the same symptoms, then the fault is somewhere downstream from the logic board, i.e., in the video cable or the LCD itself. AHT isn't able to test those.

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