In the last week the screen on my iMac G5 has been displaying green dots all over the place. I know the issue is not with the screen itself because I was able to capture the pixels with the Grab program taking a screenshot (posted below). What could be causing this? The graphics card or something else? Thanks! EDIT: So just thought about this...you probably won't see pixels in the picture on your screen, I just do on mine. Anyways, the screen gets progressively worse over time and now there are both green and purple lines of pixels all over the screen distorting words and pictures.