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I have BENQ 15 inch LCD monitor. When I turn on monitor, contrast or brightness dialog is automatically displayed on screen and I cannot remove this dialog. If I increase brightness, automatically decrease brightness. Most of the time on/off, contrast button of monitor do not work. What should I do?

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RMA if it's still under warranty? – Jin Oct 12 '11 at 3:19
No, it's not under warranty. – Jesi Oct 12 '11 at 3:38
Further suggestion please!!!!!! – Jesi Oct 12 '11 at 3:49

Replace it. There's nothing much you can do, tbh. Maybe hit the reste-factory-settings on the OSD, if it's there

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