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You may have failure in the power supply due to bad caps, bad inverter circuits such as shorted transistors, transformers, bad lamps. You need to open it up and make some measurement, see example of failed ACER monitors: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.
Often problems with LCD monitors can be traced to bad capacitors. The following sites will help you identify if your monitor has bad capacitors, and how to replace them.
www.fixyourmonitor.com and http://www.youtube.com/watch?v=9Q6_TgNJvQw
If the screen blinks on and off, first place to look will be the power supply, look for bad caps first, post back what you see so we can guide you further, see example of failed VIEWSONIC monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums
Hummm. Try to unplug everything, reconnect, than restart. If not working, try to plug your monitor on a different computer to diagnose what is wrong, the computer or monitor. It could also be your graphic adapter, verify that it is firmly attached to the motherboard.
Lastly, replace the defective part.
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