5 pink vertical stripes, new video card and screen tried,

Hi I have replaced both the video card [brand new] and the screen but the problem has not gone,

Is it the logic board that needs to be replaced? Any way I can confirm this? Thank you

Update (05/21/2019)

Hi Dan,

Actually to be more accurate, after repeated rebooting the the iMac started working normally,

I then did the hardware test and all passed but now after almost 3 weeks it has stopped working with the same typical 5 pink vertical lines as before,

I have not connected it to an external monitor. Do I need a special cable for this, Thanks again!

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Can you post a few pics so we can see what you see on the screen.

Also have you tried an external monitor to see if the effect is on it as well.

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All you need is a Mini DisplayPort cable to either a VGA or HDMI connection needed on your monitor. As example Mini DisplayPort to VGA Adapter

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