Cannot undo changes to display because of the white screen

Laptop Lenovo G510; Windows 7

I'm trying to set up the laptop to an external monitor via HDMI. I tried a setting, but it didn't work. However, the laptop screen went white and now I can't undo the changes.

Upon restart, the screen works up until the start of window screen, and then it turns off as the computer continues to boot.

Start in safe mode works, but I can't access the properties of the graphics from there.

Tried to unplug the HDMI cable, but does not help.

How can I report the default display settings without doing a hard reset? (It isn't my own computer)

Ok. I solved the problem by returning to a previous restore point.

Tags: Lenovo Notebooks

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