my mouse can always move to a non-existent monitor screen area

I have a LG external monitor connected via HDMI. When my external monitor is turned off, my mouse can always move to the non-existent monitor screen area. Is there a way to fix this? The mouse works off the screen, that it is difficult to use. Still using Yosemite.

Unplug the cable from the screen at the end of the MAC.

Tags: Notebooks

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