As of a week ago, my iMac will either shut itself off when asleep or, if closed down properly, will not start up when I press the power button the back.
This behaviour is intermittent.
It will start up if I reset the SMC by taking the power cord out, wait 15 secs then plug it back in.
So does anybody have any idea why the SMC needs frequently re-setting, but not always.
Happens if the Mac is attached to a power strip more often than not. Seems OK when plugged directly into a wall but only have one plug socket so can't use it like this because I run a dual-monitor set-up and some external hard drives though it happens when plugged into two different power strips and when everything else is disconnected. I have also tried two different power cords that are known to be good and no difference either.
Is it because I might need to replace the battery in the 2008 iMac I have as this might remember the SMC settings and now isn't?
I downloaded and ran Apple System hardware test software by booting from a thumb drive and it said all was OK.
Anything else I can check or ideas for troubleshooting? Can't afford a new Mac
This behaviour is intermittent.
It will start up if I reset the SMC by taking the power cord out, wait 15 secs then plug it back in.
So does anybody have any idea why the SMC needs frequently re-setting, but not always.
Happens if the Mac is attached to a power strip more often than not. Seems OK when plugged directly into a wall but only have one plug socket so can't use it like this because I run a dual-monitor set-up and some external hard drives though it happens when plugged into two different power strips and when everything else is disconnected. I have also tried two different power cords that are known to be good and no difference either.
Is it because I might need to replace the battery in the 2008 iMac I have as this might remember the SMC settings and now isn't?
I downloaded and ran Apple System hardware test software by booting from a thumb drive and it said all was OK.
Anything else I can check or ideas for troubleshooting? Can't afford a new Mac