8500 strange artifacting

NE555

6502
Can you guys help me with this strange artifacting on my 8500? 
I am having a suspicion it could be the VRAM SIMMS, but what do I know? That's why I'm asking
You can see that it only seems to affect the background Not the windows themself.

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Calibration of the monitor? Try another video cable or LCD, make sure you let it auto adjust.

 
tried another LCD, I don't think the problem is the LCD , it would be uniform all across. Not just the background.

 
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