iMac screen goes black.
I have a 2010 27” i7 iMac that has decided it no longer wants to display the display.
For the past few months the screen would randomly shut off every once in a while, almost as if it was put to sleep. Usually a few clicks on the mouse or a couple of taps on the power button would wake up the monitor. Then, about a week ago it became much worse. When starting up, the display will work for about 4 or 5 minutes before going black. Waking it from a long sleep will also see it work for a minute or two at most. Thinking it may be a heat issue I cranked the fans using iStat menus with no change. I’ve tried safe boot and resetting the PRAM, neither worked. Also watched the console when things go dark but didn’t notice anything that stood out. Luckily I still have our old Apple 20” lucite Cinema Display and an Apple DVI to ADC display adapter so this has become our “second” monitor.
I did open up the iMac in the past, once about 3.5 years ago to add a ssd drive when the spindle drive became too slow, and again a year later to replace said spindle drive with another ssd.
This computer doesn’t owe us anything, and it will be replaced after the keynote next week, but I was just wondering if there was anything else that I could try?
The most common reasons for the black screen of Mac:
1. installed a new macOS or macOS update
2. restarted your mac
here are some suggestions for DIY verification:
1. check the power supply
2. check the display brightness by pressing F1 and F2
3. reset NVRAM/PRAM
4. boot into safe mode: pressing Shift key while booting
5. run First aid in recovery mode
6. reinstall macos
have a nice day