HELP!!! Screen glitching HARD (pictures inside)

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oh god oh god oh god...

full screen:
dsc_0042.jpg
close-up:
dsc_0042 copy.jpg

doing @ time happened scrolling through google image searches article i'm writing. had multiple applications open including chrome, firefox, indesign, textedit, , excel, of computer has handled fine before.

while, able put sleep mode , when woke up, fine. shortly after that, however, screen went blank , replaced little white tiles couldn't take clear picture of. computer unresponsive, managed shut down holding power button, turned off frightened workhorse computer right now. :(

specs:
2011 27" imac
i7 intel 3.4 ghz
radeon hd 6970m w/ 2gb of video ram
12 gb ram
1 tb hdd

did have applecare on baby , did have corruption in screen while back, taken care of , covered applecare in 2013. applecare expired in may of year.

installed big firmware/software update on machine (through app store , legitimately) 2 days ago , maybe reason why i'm having problems right now, i'm not sure.

please, tell me there's easy fix and/or better soon. frightened right because workhorse computer , cannot afford loose now. :(
 



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