My screen is blinking since latest upgrade?

What causes screen to blink or flash? This started after latest upgrade. How can it be fixed?

OK, well that isn't very definitive. However you can try some basic resets like doing a PRAM reset and SMC resets. If you don't know how to do these then please click:
https://discussions.apple.com/docs/DOC-3603
You may need to do each up to 2-3 times for them to work.

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