I have read that It could possibly be a screen connection issue? but I am very novice when it comes to the technical side of computers so I honestly have no idea. Have you guys got any ideas on what might be causing this? The iMac is currently off and I can't get it to boot so I can't do any system checks etc.
Because of this issue my only option is to leave the iMac on and with a screensaver so it doesn't go to sleep. Im at the stage now where I can't even get it to boot, the last time this happened I tried for days with no luck and the only way I got it to boot was after I left it for 3 days unplugged and it worked the next time I tried it. When I try boot it up I hear a faint fan and maybe hard drive noise but NO chime or the normal booting 'hard drive' noise. I also experience the same problem if I shut the computer down, it can take several attempts to get it to boot up. This is the only instance when I get stuck on the black screen. It won't wake after sleep (completely unresponsive) however I can hear a faint fan noise.
For about a month now I have been experiencing a unresponsive black screen, it would usually happens after the computer goes to sleep. I currently have a really frustrating problem with my iMac 2012.
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