fynearts

Q: imac 27" black screen

Imac was purchased about 4 years ago and updated to Yosemite 6 months ago.  for the past 2 months i have been experiencing the screen going black.  it most of the time corrects itself and just seems to be flashing.  Its not regular, there is no pattern and twice it just went black and didnt return until i switched everything off and restarted.

 

my second screen, A Benq, shows its fine when this happens - i can see all on the second screen and i can see all external hard drives are connected, working and accessible.

 

i have googled and checked previous discussions but i still dont know what course to take?  all /any advice greatly appreciated.

 

thanks

iMac, Mac OS X (10.7.5)

Posted on Oct 19, 2015 5:51 PM

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Q: imac 27" black screen

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  • by fynearts,

    fynearts fynearts Nov 1, 2015 3:02 PM in response to fynearts
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    Nov 1, 2015 3:02 PM in response to fynearts

    hello???? anyone ?

  • by Eric Root,Solvedanswer

    Eric Root Eric Root Nov 2, 2015 12:37 PM in response to fynearts
    Level 9 (69,565 points)
    iTunes
    Nov 2, 2015 12:37 PM in response to fynearts

    What happens if you disconnect the 2nd screen?

  • by fynearts,

    fynearts fynearts Nov 2, 2015 2:21 PM in response to Eric Root
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    Nov 2, 2015 2:21 PM in response to Eric Root

    why do you think it might be the second screen?   the two screens have been together for 2 years with no problem ... this blackout thing is intermittent and only started a couple of months ago. .. curious as to why you consider it might be the culprit - from all the reading i have been doing for ages now everyone was talking about it being other possiblities - all of which dont really seem to pinpoint a real solution or even what the actual problem is.

     

    i havent disconnected 2nd screen but will try it .  thanks for the reply/suggestion.

  • by Eric Root,

    Eric Root Eric Root Nov 3, 2015 12:47 PM in response to fynearts
    Level 9 (69,565 points)
    iTunes
    Nov 3, 2015 12:47 PM in response to fynearts

    You are welcome. I don't know if it is the second screen, but disconnecting added items often clears a problem, so it was something to test.

  • by fynearts,

    fynearts fynearts Nov 3, 2015 3:17 PM in response to Eric Root
    Level 1 (0 points)
    Nov 3, 2015 3:17 PM in response to Eric Root

    ok i have done that ... all good for a day now but the black screen was intermittent ... will TRY to keep second screen disconnected for as long as possible.  If it is the screen how do i make sure it doesnt do it?  perfectly good screen ....w orked together for a long time now and this thing is sudden - would you hazard a guess as to what is causing it?  will keep posted ... thanks again

  • by kgiannis,

    kgiannis kgiannis Jun 8, 2016 8:17 AM in response to fynearts
    Level 1 (12 points)
    Desktops
    Jun 8, 2016 8:17 AM in response to fynearts

    I have a problem about 3 days ago.

    When i open my imac with button, i listen the mac start up sound (https://www.youtube.com/watch?v=XZ1mpI01evk) with Black monitor and the mac start up sound repeat again and again with black monitor.....Nothing more

    I try to disconect the imac and connect again, press cmd+R or cmd+R+T but nothing.

    I call the Apple support center in Greece and they dont know nothing and dont help me.

    Does anyone the same problem ??