Have a 3 yr old iMac the screen goes black when using it it will come back on when you move the mouse  thanks for your help Dave

Have a 3 yr old iMac the screen goes black when using it it will come back on when you move the mouse  thanks for your help Dave

It's possible you've got a 'hot corner' set up. If you have and move the mouse to a certain corner of the screen it'll do as you describe. Have a look in System Preferences>Mission Control, bottom left of the window click on the 'Hot Corners' button and see if there is anything in there.

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