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Model A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 or 3.5 GHz Core i7 Processor, ID iMac14,2

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Only purple lines on startup

Machine came to me and on startup had one wide purple line in the middle and no startup chime. I pulled the drive and replaced the power supply. Machine booted great off of a flash drive with Catalina installed. Ran the machine for 2 days. Ran apps, cruised the web, restarted, shutdown and started up, basically put the machine through its paces with no trouble. Picked up an SSD and installed. Now when it starts I get the chime and the wide purple line and then a bunch of thin purple lines in the middle and edges of the screen. I have unplugged and replugged the 2 display cables a number of times. I have checked the cables and sockets under magnification for damage and see none. I have wiggled the cables while the machine is running with no change. I disconnected the SSD even, no change. I tried resetting the PRAM, no change. Has anyone seen this and resolved it? Any insights are appreciated.

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So now after plugging in the external monitor and walking away because the monitor works and the iMac display still had the lines, I checked on it and the iMac display now works, but still has the lines. I shutdown and started back up, same story, very odd

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@smugan connect an external monitor and see what that displays. Check the connectors on your LCD cable and see if those look ok?

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An external monitor does work. As stated in my original post, I have checked the cables and sockets under magnification for damage and see none.

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"display now works, but still has the lines" sounds like a bad display. There should be a separate board on the LCD monitor. Check that for any damage as well as your data display cable.

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Now the lines are gone and the display looks fine. Shut it down for a while and started it back up, still looks normal. This is so bizarre!

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ElectBlue sera éternellement reconnaissant.
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