Vertical blue lines on startup on 27" iMac (Late 2012) | HardwareZone Forums
Review: 27-Inch iMac, The World's Sexiest Desktop Just Got Sexier | Cult of Mac
SOLVED: Monitor has vertical lines at start-up. - iMac Intel 27" EMC 2546 - iFixit
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iMac multicolored vertical lines on scree… - Apple Community
SOLVED: Vertical lines issue on iMac late 2009 - iMac Intel 21.5" EMC 2308 - iFixit
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Blue vertical lines on boot up and just b… - Apple Community
I have a 27.5 iMac where the screen locks… - Apple Community
Mid 2011 iMac vertical lines, Glitched apple logo and progress bar, Boots into white screen. (I think its the GPU. If so, Is there a way I could use integrated graphics?) :
iMac Vertical Green Lines Oven Bake Repair - YouTube
SOLVED: Vertical lines issue on iMac late 2009 - iMac Intel 21.5" EMC 2308 - iFixit