iMac with flickering of the screen crash

Hello

for two days my iMac starts flashing with green and bright stripes flashing until the screen is 5 cm off to the left. Finally, everything crashes. Sometimes with a blue screen, sometimes with a white screen as a window only to see a very small strip on top.

No new software has been installed, not new material. It does not start when I use special software or when it's too hot. It crashes just out of nowhere.

Test hardware Apple did not find anything. Updated for 10.11.6 does not help.

I could test or do to fix?

Video of one of the accident:

http://vid161.Photobucket.com/albums/T202/Gorilladrifta/iMac/Mac%20Crash_zpsibr7 urxm.mp4

Tags: Mac

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