Contrast window pops up and dims the screen. Pushing the up arrow button and the 1 button accesses the powerlock screen and makes it go away. pushing the 1 button to bring up the menu does nothing. the only thing that seems to work is the powerlock setting. The contrast window pops up quite frequently and is driving me nuts. After a 4 day email session with viewsonic they came to the conclusion that my monitor has a problem and needs diagnosis and repair.
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