How can I remove grid patern of monitor

A square grid model suddenly appeared on my screen.  I don't know why or how to remove it.

Screenshot would be useful, however I suspect it is a hardware problem.

GPU, LED/LCD, cable or cable connection problem.

"Apple Service Diagnostics' test

Genius of booking http://www.apple.com/retail/geniusbar/

Online https://getsupport.apple.com/GetproductgroupList.action

check the warranty https://selfsolve.apple.com/agreementWarrantyDynamic.do

Tags: Mac OS & System Software

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