iMac mid 2011(Snow Leopard) turn black screen when internet is on..

St7001

macrumors newbie
Hi MacRumors,

A years old iMac i5 quad-core, 12GB been funny recently.

First discovered when watching youtube, halfway it turn black screen & unable to recover back( moving mouse or type anything on keyboard ) but still can hear the youtube video still playing behind with blank screen etc.

Recently, discovered without turn-on the internet(WIFI) it will work fine but not the other way.

Reading few forums, seems like is graphic card or drivers problem.
https://discussions.apple.com/thread/3819042?start=0&tstart=0

Please help or anyone had faced this kind of situation.
Thank you very much :)

:apple::apple::apple::apple::apple::apple::apple::apple::apple::apple::apple:
 
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