Imac wont wake up from sleep?


over last few days, put imac sleep in evening. when try , wake keyboard or mouse, no longer wakes up. have press power button wake it, bar appears @ bottom of screen loading, while can see background. have late 2013 27 inch imac. maybe nothing worry feedback great. thanks.
 

ive got late 2013 21inch imac
keyboard , mouse disconnect whatever reason when sleeps , don't reconnect when trying wake up.
batteries brand new

dave
 


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