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Message: <blockquote data-quote="mickibob" data-source="post: 1633951" data-attributes="member: 90459">I checked the extensions box in both browsers and there were none listed.There is no specific page when this happens.  It has also happened in word, in e mail and has happened in photoshop, too.  It seems to happen most often while I'm scrolling using the mouse wheel.  Sometimes the screen goes white, sometimes black, sometimes grey.Sometimes black and white vertical lines, once it went red, once golden color.  Each time I have to power button off and on again.     A while back I took the computer to the Apple store and they checked the hard drive and said it was ok.</blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?