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Armendegga

macrumors 6502
Original poster
Mar 18, 2009
323
217
Valdosta, GA
Late 2013 27” iMac. 1GB Nvidia 755 GPU


Need some help. Is this an issue with the screen or is the GPU dying.

Few pics. The ones where half the screen is white only happens on some webpages and on the desktop. Most other webpages look like the second image where it’s mostly still readable… mail app, finder, etc.

Initially I was thinking GPU because the full screen can render “correctly” (albeit still a bunch of bluish lines, etc. depending on what’s being displayed). However I just got a TB2 to HDMI adapter and plugged an external monitor on, and the external monitor shows perfectly fine.

Anyone know what the issue is?

(Last pic is external monitor)

D820117F-4499-4612-9A59-32E1B3E7CC91.jpegA2F85B88-3AEF-4267-971F-0048C567B150.jpeg154F6897-23F1-406F-A463-11B14F0D51CD.jpegimage.jpg
 
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