Why is there a Purple Horizontal Line across the screen?

Last night my screen suddenly generated a solid horizontal purple line across the screen around 1/10th up from the bottom of the screen.

It came from no where. Its not software as, when I change monitors, its not on other monitors. So I’m thinking its a hardware issue. (though its not the screen - when powered down the purple line is gone - so its pixel based).

I turned the system off last night, hoping maybe it was an overheating issue. Turned it back on this morning. Line is still there.

The rest of the screen works fine, including pen-sensitivity. Just wondering if there is a cheap fix to this issue?