It sounds like either a bad signal input , possibly from a loose plug on the cable from the PC or bent pins on the plug / the video graphics card in the PC/ or the settings on the monitor need adjustment. Use the OSD (On Screen Display)
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First check to make sure both ends of the cable from the PC to the monitor are not damaged and are seated good & tight.
If those are fine then unplug both cables from the monitor & leave unplugged for 10 minutes or so to see if the screen has an automatic reset.
If that does not work then use the monitors OSD (On Screen Display) to adjust to default settings. If that does not work, plug the monitor into another known good PC.This will tell you right then if its the monitor or "Your" PC.
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Here is your manual if needed
http://www.retrevo.com/support/Acer-AL1717-Monitors-manual/id/719ag107/t/2/
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