Half of screen is dark with distinct line between dark/light

half of the screen is dark with a clear line between dark/light visible.

If you haven't done any trouble shooting then begin with restarting in Safe Mode and if that doesn't work reset (may need to do each 2-3 times) both the SMC and PRAM. Finally if that doesn't work run Hardware Test in Extended Mode (again 2-3 times) to test for hardware issues.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
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. You must press this key combination 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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    option 1: Concatenate the "end of line" string constant (this is a combination of CR and LF, located in the string pallete) to all your outgoing commands. Make sure in the "Visa configure serial port" the "Termination character enable" flag is false.
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