iMac 27 late 2015 with display glitches and issues

Hi,

I’ve just published two videos on youtube so you can see how weird the display is getting distorted. I’d like to know from your experience what kind of problem is this? Anyway the computer never crashes or shuts down.

This happens once in a while (four times in six monts)… I have to mention that two years ago the iMac was professionally handled to replace the HDD.

Thanks for your comments

https://youtu.be/aLRRrT4MumA

https://youtu.be/3ixWElrcbnY

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What do you see on a connected external display?

さんによる

I don't have an external display onsite to test, remember the problem shows up very rarely, once per month if any, so I guess I'd to leave another display connected until it happens again, right?

@danj

さんによる

The problem is we don't know if the display or the graphics services on the logic board is the issue. This is the easiest way to isolate the issue.

さんによる

Thats right, I'll plug a screen and inform later results, thank you!

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