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Disconnect everything from the monitor including power. wait a minute. Connect only the power. If it still does not power up the monitor power supply is dead.
Not much to do but replace the monitor.
it happened to me. I changed computers but that did not solve the problem so it's not the video card. what did help was I turned off the monitor to reboot it then, using a different computer I reset the resolution to the lowest possible setting. when the monitor adjusted to the new resolution it reset itself. I then set it back to the higher resolution and everything was centered again.
You could have a faulty power supply. If the capacitors have a blown (deformed top) then they are faulty. Replacing these capacitors with new ones may fix the problem provided nothing else is faulty. Make sure you replace them with the same voltage and capacitor rating.
Check your power supply. IF it is through a UPS then try connecting directly to a main supply. If problem persists then look for a ACer service center immediately. There might be a problem with the panel.
Go To Start > Programs > Accessories > System Tools > System Restore. Select "restore my computer to an earlier date". Look at the LIST of Restore points. Find the DATE when this "Security Update" was installed and Select the last date before it was installed and Follow the "Wizard" to Restore it to BEFORE the Update you think CHanged Things. Too many variables to figure out without seeing it to determine what was changed but that will correct the situation and you will not loose anything.
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