Macbook screen goes blank


got in feb , have had no problems, when cursor moved top left hand corner off screen , beside wee apple symbol. goes blank maybe second , thats it. beginning bug m been doing on week. ive read similar problems none exact same mine mine goes blank when ive placed cursor on top left others have shut down , randomly please
 

you have "hot corners" enabled, activates screen saver when move cursor corner.

system preferences -> desktop & screen saver -> hot corners button
 


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