Windows – Revert resolution change in Windows 7 (screen gone black after change)

resolutionwindows 7

I changed my screen resolution from 800x600 to 1280x1074 and now Windows starts up but there is no display and a message comes on a black screen saying Input not supported. I can only start Windows in safe mode.

I checked in safe mode but there was no restore point available. I am using Windows 7. How can I get my screen resolution back?

EDIT:
i tried setting the resolution to 800×600 in safe mode and rebooting but still the screen remains black.
Also i enabled the 600x480 mode but still the same.

Best Answer

Try changing the registry keys that holds the resolution information for the display:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Hardware Profiles\UnitedVideo\CONTROL\VIDEO
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Hardware Profiles\UnitedVideo\CONTROL\VIDEO

Each of these branches contains several keys relating to the resolution:

DefaultSettings.XResolution
DefaultSettings.YResolution

Reboot into safe mode. Export the whole branch to make a backup incase something goes wrong. Find all the keys with the resolution that is not working, and set them to the resolution that worked. Reboot.

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