IMac G5 2.0 freezes within minutes of startup

My iMac G5 2.0 freezes within a few minutes of starting up. By "freezes" I mean the spinning beachball appears, and the computer will not respond. This is often preceded by a distinct "metronome" kind of ticking (it sounds like the hard drive freaking out, but I don't know for sure). I have run all software updates (10.4.8). I zapped the PRAM - no change. This has been getting worse for a while. I used to think it was a particular program, like Mail or Safari, but now it crashes with either one, before I can even open them both. I have read many other posts, but none of them mention the beachball (I am not getting any error screen at all), and none of the mention the metronome/ticking sound. Help!
iMac G5 2.0Ghz Mac OS X (10.4.8)

Thanks for the quick reply. My computer does not fall within the repair program (my iMac is a 17-inch, EMC 2055), and I am not under AppleCare (my iMac is 19 months old). I don't think the hard drive is dying, because I have heard the sound once in a while since I first got the computer (I guess it's possible that it was bad from the beginning). If it is the power supply, any idea how much that will cost me?

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IMac G5 2.0 freezes within minutes of startup

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