Chosen Solution
I have experienced sudden black screen ever since the upgrade to El Capitan. I eliminated all of the possible causes I found on forums. (e.g. overheating, loose wire, power supply, keyboard, interference and graphic card) To get the screen working again I did 3-5 PRAM restarts after which everything would be fine for 2-3 days. Then it would happen all over again. Problem solved! I erased the drive on which MacOS High Sierra resides, re-installed software from the original discs, downloaded all updates from the past few years, re-installed Yosemite (Capitan is no longer available – I wonder why?) Then back to High Sierra. Only then could I restore all of my settings and preferences from Time Machine. High Sierra converts the SSD drive to APFS and older OS’s cannot read it. WARNING!: the above didn’t work out the first time and repeating the procedure took up most of a whole weekend. I’m now looking into a bootable USB flash drive with High Sierra install on it in case I have to do something similar in the future.
First let’s both get on the same page. Please look on the bottom of your stand and get the serial number and plug it into the following link them let us what you have. https://everymac.com/ultimate-mac-lookup… Next please tell us what upgrades you may have done to this machine.
