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











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










