Strange dashes appear on screen

have had no issues with my system. came back from screensave to the attached screenshot. strange dashes appear all over screen, every program, and move when moving cursor or typing, etc.
have tried rebooting, changing resolution back & forth, no change.
has anyone seen this??

They advised me to:
* Reset SMC.
* Reset NVRAM.
Of course neither of these helped. Their advice is to take it to the nearest store, which is 45 minutes away. I'm asking the community if anyone has seen anything like this before and if so what was the outcome? The support agent did remote view my computer and saw the marks, which verifies that it is software and not display-related.
Graphics card? Is that even replaceable in this model iMac?

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Strange dashes appear on screen

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