Thin vertical line on my iMac display

Hello!

I have an iMac 27 5K 2017 and today I saw a thin pink vertical line on the display.

I tried to reboot, but it didn't help.

I turned off my iMac and gave him a rest, but it didn't help either.

It looks like a problem with the display. I tried to make a screenshot and I don't see that line on the screenshot.

My question is more about the reason for this. I had a power surge yesterday and my iMac just turned off then. But there was no line back then.

Could it be still the reason for this?

Thanks!

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Kind Regards, Dmitry