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If I understand the issue, it sounds like the
monitor screen is going out.
But there are a couple of things to try since
being close to a high voltage source or incorrect Resolution setting could
cause something close to that.
Let us start with the Display resolution since
it is the easiest.
Hold down on the Apple in the upper left-hand
corner of your screen.
1. Select System Preferences
2. Click on the Displays icon
3. In the box under Resolutions make
sure a resolution selected has 60 Hz if you are running a Flat Screen (LCD)
If that is not the issue, try moving the Mac to
a different location. (Next room)
If that does not work, try booting the machine
for the install disk, if it looks fine when running from the disk you could
have a corrupt driver. In that case reinstalling the OS should fix it.
Ok none of that works: Take the machine to your
local Apple store for the Genius to look at. He should be able to tell by
looking at it what is up.
Best of luck.
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