27" iMac Freezes, LOUD screeches from speakers?

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well problems seem continue new i7 27" imac.

today, computer froze on me , happened, imac had loud screeching sound coming speakers. computer totally unresponsive, had push , hold power button turn off. freaked me out because sudden , loud.

posted while ago computer freezing , have restart holding power button. never had loud screeching speakers when did freeze while ago, every time freezes screeching there.

suggestions problems may be? have added additional ram computer , i'll list specs if helps @ all. have 24" cinema display plugged computer.

27" - 3.4ghz i7 imac
1tb hdd
amd radeon 6970m - 2gb vram
12gb ram (came 4gb, upgraded 12gb)
 

take directly applestore or friendly apple authorized service provider, have hardware issue that's not ram related.
 


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