This model AL2017 20" Acer monitor is known for having a bad power inverter board. The capacitors go bad, which causes the backlight to completely stop working or flicker intermittently. If you feel like you are electronically and mechanically inclined the board is easily replaced. Search ebay for AL2017 Power Board -- its about 15 bucks plus shipping.
Make sure the power cord is proper and try to connect the cord in diffrenet power outlet and try to switch it on.
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