JamesBKK

Q: iMac will not boot, green vertical lines on screen

My iMac 27" purchased in 2012 is running Mavericks OS.  I did a software update last week, and switched on the machine for first time since then, today.

 

I get 4 or 5 green vertical bars down the start-up screen with the apple logo and timer running.  The screen then goes to a grey screen and just hangs.

 

Tried safe boot and nvram clear but did not work.  Will try again this evening.

iMac

Posted on Jul 21, 2014 1:30 AM

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Q: iMac will not boot, green vertical lines on screen

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