Win7 computer resolution can not be adjusted how to do

First you need to check whether the display supports that resolution, the method is: Right click on the desktop blank, open screen resolution settings, click Advanced Settings, click on all the models, and then we can see in that list of supported resolution, if not supported words can not be adjusted.

Confirm that there is an external display, if there is an external display please see if it is replication mode, because the resolution can only be set to the maximum resolution value in replication mode, is the external device and the built-in display minimum resolution. For example: The computer resolution is 1280*1024, the external device resolution is the most 1024*768, when copying mode, the largest can set the resolution is 1024*768. If you need to set the resolution separately, you can set the resolution of the two screens individually by extending the display.