Sleep/wake functioning does not properly

I recently bought an iMac 27 '' new. I have problems with sleep/wake function. It works erratically. He'll still go to mode 'sleep' when I choose that, but about 60% of the time it won't wake up when I want that. I have to turn off the power and restart to power the computer. I got off the computer rather than put in mode 'sleep'. Does anyone have any ideas on how I can fix this? I've updated to the latest version of El Capitan and run the appropriate version of the OnyX, but nothing seems to help.

A secondary issue is with an external hard drive. I have three connected to the computer. One and always the same, 'evil' ejects itself randomly. It appears and disappears at will. Does anyone have ideas on this?

Thanks for any help that anyone can give.

Reset the SMC. Choose the appropriate method.

https://support.Apple.com/en-us/HT201295

Tags: Mac OS & System Software

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