IMAC freezing, hang during startup, loud noise coming out from the speaker

I am using the iMAC i3 Intel based which i bought it just a month ago
Last week it hang, freeze just like that without me launch any application just yet
I hold the ON button for a restart, and it freeze during the startup
One more thing, sometimes when it freeze, there's a noise coming out from the speaker ( just like there is no signal from the TV )
Already sent it to the Apple Service Center but they tell me it is free from any error, but by the time i bring it back home, not even 12 hours, it freeze again just like that with loud noises coming out from the speaker.
Btw did i mention, sometimes there's also a screen distortion
Please somebody help me

I've experienced similar symptoms to the original poster's description. I have an iMac 27" 2010 model. This may be related to the following:
I've looked on numerous forums regarding the freezing problem I was having. This problem would arise on a wide range of systems.
Symptoms included but were not all always present - usually when I am loading the system with games/heavy load processes:
- Full system freeze, screen still on.
- Loud cracking noise coming from speakers (relative to what volume was at when the freeze happened).
- Computer asleep but I cannot wake up unless hard reset with power button.
- My screen backlight was also damaged (permanently dimmed) near the left side, and progressively got worse over time. This was fixed (replaced LCD 27" display $600+ and covered by my creditcard extended warranty)
Basically, what I've come to realize which has not been well documented as far as I could find relating to this problem - is that the system is overheating and causing these freezing errors (and LCD damage in my case). Prologned occurances could result in different system part failures.
How do you fix the overheating problem? Give this a try, it's worked so far for me and I've actually been able to continue video/photo editing without having this annoying freeze.
Search for and download 'iStat Pro' (widget addon that lets you monitor your system temperatures... compare it before and after the fix)
Search for and download 'SMCFanControl (a great little app that allows you to change your system fan speeds) - I did not know this was possible, and have never heard the fans go this high when it was being run automatically by the system. The fan's are obviously louder when set to max, but is well worth the system cooling results.

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