Crazy plaid-Like screen at start up

Momentary before OS X window appears. Have worked with Apple Support on phone but no help. Tried Test users. Used Tech Tool & etc.
Is this a problem?

You need to document a complaint to Apple. I don't know how that could be done, but they already have a complaint on your Applecare claim number. I would say call them up again and hope to get a more helpful technician. Maybe someone else here has a better idea.
Just one question. After this checkerboard pattern does all work OK after that?

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