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Message: <blockquote data-quote="unxposed" data-source="post: 728003" data-attributes="member: 68015">Here's a riddle for you...I've just got my new refurbed iMac... occasionally, and randomly, whilst loading my software and transferring files a red dotted line appears around the shadow of all windows, and across all toolbars.When I restart the red lines dissapear.I have taken screenshots of the problem, and when I open them whilst the problem still persists (and zoom etc.) the red dotted lines are still there in the screen shot. However, when I view the screenshot when the problem isn't there, or on another computer, the red lines are gone from the screenshot.What is wrong with my mac? The screen? The graphics card?...Thanks!</blockquote>