I'm hoping this is not a hardware problem but it is starting to feel that way.
I have a 2017 27" i7 iMac running Mojave that has started misbehaving over the last few months.
I will be in another room of the house and notice that the iMac has woken itself from sleep. When I investigate I see that the Mac is sitting at the login screen but the colors on the login screen look wrong and the image is posterized.
If I log in (or it just logs me in automatically with my Apple Watch unlock feature) the display is completely normal... there is no graphics corruption in the desktop only the login screen.
Is this a known problem in software?
I have a 2017 27" i7 iMac running Mojave that has started misbehaving over the last few months.
I will be in another room of the house and notice that the iMac has woken itself from sleep. When I investigate I see that the Mac is sitting at the login screen but the colors on the login screen look wrong and the image is posterized.
If I log in (or it just logs me in automatically with my Apple Watch unlock feature) the display is completely normal... there is no graphics corruption in the desktop only the login screen.
Is this a known problem in software?