Since installing High Sierra I cannot get my iMac to sleep.
When it seems about to go into sleep mode the HD's both internal and external whir back up and the iMac stays awake.
My external HD's are getting very hot being continually on and I know this isn't good for them.
I wondered if this coincided with the upgrade to Firefox Quantum but even if I close this down and all other apps the iMac will still not sleep.
Any suggestions please?
When it seems about to go into sleep mode the HD's both internal and external whir back up and the iMac stays awake.
My external HD's are getting very hot being continually on and I know this isn't good for them.
I wondered if this coincided with the upgrade to Firefox Quantum but even if I close this down and all other apps the iMac will still not sleep.
Any suggestions please?