Black screen what is the problem
I have similar problem I can see little with torch light. But if I keep off the power for about 24 hrs sometimes it works fine.
Please guide me how to solve this problem
If you see a faint image using a flashlight then you have a backlight issue. Often times I find the LED Driver Board needs replaced iMac 21.5" LED Backlight Board, Apple P/N 661-5304 and here’s the guide to put it in iMac Intel 21.5" EMC 2308 LED Driver Board Replacement
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