I Have a Black Screen when I turn on my IMAC 2011?
It was working fine one day, then the next day I turned it on and I got a “BLACK SCREEN”. What causes this?
iMac 27″, macOS 10.15
On a 13-year-old computer, lots of things can cause that. When it happened to my 2010 iMac it was a video hardware failure. And, like yours, it worked perfectly one day and failed the next morning. Other common age failures affect the hard drive and power supply.
Do you hear the standard start-up chime?
Have you tried starting with all peripherals (except mouse and keyboard) disconnected?
Tried booting into Safe Mode?
