I went to screen saver to find a solution to get rid of the gray side bar showing up on my desk top screen but could not find how to get rid of it. I want a full screen without the gray bar. Please advise.
Hello. That problem can be hardware, such as a faulty mother board (the video card is part of the mother board on the iMacs). This also depends ont the iMac model that you have. If it is a G5, there was a series problem with condensers on the motherboard, but it is now too late to claim a replacement. If it is a newer iMac with intel chip, I would advise to bring the Mac to an AppleStore near your place or a repair shop for a complete diagnostic.
I think that on an iMac, this kind of problem can't be software related, because it is an all-in-one desktop with no separated screen settings.
Hope that helps
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