1/8 of screen is flashing

Hello,
MacBook Air
The right most 1/8 of the display is flashing. And now,the left 1/8 has started flashing.
Couple of screen shots

nothing is apparent from the screenshots, of course capturing flashing is rather hard obviously
SMC reset and reboot see if same.
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. 

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