Why does the resolution on my computer change every time I shut it down

When I reboot my computer the screen resolution changes from 1366x768 to 640x480. How can I fix it?
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More about resolution computer change time shut down
  1. need more information. desktop? laptop? custom build?
  2. I had the same problem on a new PC build. I figured out that if I changed the resolution from the Windows software instead of the graphics card software and made sure that it was shut down properly by "restart" or "shutdown", the resolution saved. You may have to uncheck the box "Hide modes that this monitor can't display" to set the resolution you wish. Right click on desktop. Got to /properties/settings/advanced/monitor and uncheck "Hide modes that this monitor can't display", click apply then OK, then go back and select your resolution and click apply then Ok again. The setting should save after reboot.
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