My 24" IMac freezes and makes a popping sound in the speakers. What could be wrong?

Good afternoon
I have an early 2008 24" imac, 2.8GHz Intel cor 2 duo, mountnain lion 10.8.2. From time to time it suddenly stops, and makes a popping noise from the speakers and then the computer is frozen, i have to press the power button. This is now happening more often, at first i thought it might be flash as it use to happen on youtube videos, but today it froze whilst usling skype.
I read on the forms, but my problem is not exactly as the ones on forums.
Does anyone have this problem? Could it be the harddrive failing. I did a clean install of mountain lion last night and it happened still, the hard drive is a 320gb Hitatchi
Thanks
I have included a youtube link of what it looks and sounds like.
http://youtu.be/jBo9g2Z8U0E

You should try whats called a smc reset, look up HT3964 it should help, what you do is turn the imac off unplug the power cord from the back and hold down the power button for about 15 seconds then release and plug it back in.
If that doesnt work try a pram reset, HT1379, just google the number and it will pull up.

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My 24" IMac freezes and makes a popping sound in the speakers. What could be wrong?

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