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Usually when a PC monitor like this one has multiple inputs, there is an input change button (much like the one on a TV). It might be hidden in a menu. Make sure that when you have both devices connected and turned on that you're switching to the correct input in order to view the other device. It's very unlikely that it will switch automatically.
If you're viewing the correct input and you're still not getting a signal from your Xbox, it could be a defective monitor connection. Try switching the cable first: use the cable that you know works and connect it to the second input to make sure that it's not a cable problem.
If the cable is fine but the second input still isn't working, the monitor input connector is probably malfunctioning. Depending on how long you've had it and if it's still under any kind of warranty, you may want to contact Acer for further support and see if they can either fix it or replace it for you.
remove power to your monitor; then remove the monitor's back cover and, front cover; when you can see the circuit board check for a buldged can capacitor or, two; replace these by unslodering them and, resoldering the new ones in place digikey.com sells the capacitors (don't forget the position of the capicitors they go in only one way
I see many monitor with that trouble.
When you turn on comp., you can have a picture on monitor about 10-30 min. and that go in black screen, or If you change resolution again go in black screen.
You must repair monitor or bay another.
Ive seen this on other monitors. Look for a 1 and 2. Some monitors do NOT auto detect a signal, and this one might not. Look for a way to set the monitor from Digital input to VGA input. Try that and see.
Sounds to me like the input has gone out of the boundaries the monitor supports. IE the refresh rate is too high frequency (normally 60 to 72 Hertz for LCD's) or the screen resolution has been set too high.
Go into safe mode and set it back to 1024 X 768 at a frequency of 60 Hz, once back into windows proper you can try higher resolutions and change your refresh, if the screen goes black or displays a message "Out of Bounds" or similar it should revert after 15 seconds if left alone.