Acer WT 300 User Manual page 27

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When the necessary information is supplied, choose "Next" to set
your video display resolution. The screen below shows the
current setting of the video display resolution.
Note: Make sure the resolution you select is supported by you monitor,
otherwise your monitor will only display a blankscreen.
After choosing your video display resolution, choose next and
click on "Finish" to finish the setup. A dialog box will be
displayed asking you if you want to keep the selection. Choose
"OK" to keep the selection or "Cancel" to pick another one.