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Check the cables and the computer connection VGA outlet. If doesn't work and your monitor is under warranty ACER will repair your monitor for free. If not, the better option is get a new one instead of repair due the high cost.
You probably have a few dodgy caps on the power board inside. It's an easy fix if you are confident around electronics.
If not, pop it off to your local TV repair shop and have it taken care of now before it gets expensive with a complete failure.