I've just downloaded software -now have a thin blue line on my screen? pls. help.

I have just downloaded some software...when my computer restarted, it now has a thin blue line on the screen. What's happened?

A: is it in all screens or just Chrome (unlikely)?
B: reset SMC
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
C: Your LCD is highly likely NOT broken rather a signal feed hardware issue in the monitor cable that travels thru the hinge from the logic board.
D: make a screenshot and verify if the screenshot shows the same or not.
E: the LED backlighting is showing thru implying, of course, that the LCD feed for that vertical line is not being fed.
Reset SMC and verify.
if same, you have either bad monitor cable or connection of same at junction with logic board.
At which point make appt. with Apple for diagnostic / service

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I've just downloaded software -now have a thin blue line on my screen? pls. help.

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