iMac 5K takes ages to wake up from sleep

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Level 1

4 points

iMac 5K takes ages to wake up from sleep

If my 5K iMac has been asleep for a while, when I press the space bar to wake it up, it takes about 10 seconds to wake up from sleep. The screen immediately turns on and the desktop appears, but the dock is white and the Mac is unresponsive. A second or so later, the screen turns black but with a small corrupted image in the far top left. At this point I can hear the HDD spinning up. My Mac has a Fusion Drive. Then the desktop appears again as normal and I can use my Mac. However, I have to turn Wifi off and on again to get it to work. Does anyone else get this?

iMac with Retina 5K display, OS X El Capitan (10.11.6)

Posted on Aug 18, 2016 11:53 AM

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Answer 1

den.thed

Level 10

92,398 points

Aug 18, 2016 12:21 PM in response to fossda

Reset the SMC, as per > Reset the System Management Controller (SMC) on your Mac - Apple Support

reset the NVRAM, as per > How to Reset NVRAM on your Mac - Apple Support

and then test it.

Then if it is still having trouble,

try starting up in Safe Mode, as per > Try safe mode if your Mac doesn't finish starting up - Apple Support

followed by a normal start-up and then test it again.

If still acting up, backup and reinstall OS X, as per > How to reinstall OS X - Apple Support

If none of the above seem to solve the problem, then your next best bet is to contact Apple and make a Service Appointment with your local Apple Store or AASP, as per > Mac desktops Service Answer Center - Apple Support

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