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Diagnosing a Display/GPU issue on 2012 iMac 27"

S

seankerns

macrumors newbie
Original poster
Jan 29, 2019
7
0
So recently this grey/blue bar appeared on my iMac and hasnt gone away. Any idea as to what may cause it? Or how I should diagnose it?
Screen Shot 2019-01-31 at 10.48.37 AM.pngScreen Shot 2019-01-31 at 10.51.28 AM.png
 

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