It is helpful to let the community know the following:
What computer do you have? What operating system is on the computer?
Do you have any error messages?
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I have the same problem. Whenever I set the display resolution to 1600 x 900, the monitor resolution changed to 1280 x 960 after restart. The display resolution still shows 1600 x 900. It seems OK if I set to 1280 x 720.