I have 2 lines horizontally across my screen, it is a defect in the screen.

My macbook air has two lines that run horizontally across the screen.  They are there when the computer is off.  I have tried to clean the screen but it does not affect the lines.

Thank you Paul. I had a suspiicion it might be. I'll try the safe boot idea read somewhere else and if not will take in for a service.
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