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two things you can do, first right click on your windows screen and look for "settings" this will open a dialog box where you can set the screen resolution. Set it lower and see if your screen is now filled. if that doesn't work go into the monitor setup (buttons on the bottom or side of the monitor) and try to set the verticle and horizontal size, since its only 3/4 of an inch you should be able to stretch the screen to fill up the space.
i just finished repairing a 20 inch acer monitor that had the same issue.... you have to take it apart and examine the power supply side of the monitor. there are capacitors that go bad on that board. you can tell be feeling the tops of them... the feel rounded. replace the capacitors and put it back together and it will work fine
All LCD displays have an "Auto" button press it and see if that fixs it. should be aparent what it does if it does it. but basicly it alines the picture with the screen. when you change back to user profile you may need to press it again.
To my knowledge, it is not the zoom that has to be adjusted but rather the horizontal width, zoom would expand all (to, bottom & both sides) whereas your only concern are the two sides.
Should the horizontal width not fully expand, then there is an internal problem with the horizontal deflection circuitry which could either be the yoke, a capacitor or shunt diodes. In certain instances, a below normal voltage at the mains or the internal power supply could also cause this.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
boot to safe-mode. (f8 pressed prior to windows starts) choose "safe mode" in this advanced boot menu. If the screen displays in this mode, it's a driver issue. If it fails, it's the screen or the vid card. Swap screens (CRT preferred) if it works vid card is good, screen is bad. If it fails you must use a known good vid card to isolate the point of failure
I have 2 acer AL2016W's and have the same problem. The earlier ones with the VGA only are the problem from what I can see, they just don't play nicely with the video card for some reason.
First, on your main monitor, click "Show displays in menu bar" on your monitor control panel. This will let you set the resolution for each monitor from the main one, click on the little monitor icon on the top right screen to do this.
If that doesn't work try this:
Connect one acer as the main monitor and one crappy vga crt monitor as the second.
Set mirrored desktop in the system preferences so that the crappy CRT is displaying the exact same resolution as the acer. (1680x1050 59.9Hz)
Disable mirrored desktop. You should now have an acer and a crappy CRT both running 1680x1050 in extended desktop mode.
Shut down, reconnect the acer in place of the crappy CRT.
This should "trick" your video card into having the right resolution, otherwise you'll just get the stupid "input not supported" screen, with no ability to auto configure or use any of the built in controls.