My macbook pro decided to give a different res and a horizontal line follows my cursor (like a diagnostic mode or something) i have shutdown/restrted. Fixed the res but the cursor problem still exists any help please.

I was using my mac as normal and then my resultion on mr screen changed which i have fixed using the normal methods but i still continue on getting a horizontal line whereever my cursor is even after i have restarted and shut down. The line is a white colour but my other screens seem dulled wherever this line is not following it is not a solid white. It looks like its in a diagnostic mode or somthing. Any help would be appriciated, thanks.

It is possible there is a problem with the computer's graphics, but try a simple fix. viz. reset the NVRAM / PRAM.
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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