Problem PSU. What's the correct course of action?

Hi all. I have an iMac G5 (ambient sensor) with serial number W85270XXXXX. I'm fairly sure I have a PSU problem as the machine will shut down without warning (mostly after it's been inactive for a while, but sometimes during boot).
Grep'ing through the system.log reveals lots of:
AppleSMU -- shutdown cause = -122
I purchased the machine in Sept '05, and don't have AppleCare. Am I out of luck here? What is the proper course of action to resolve this (as cheaply as possible -- I'm perfectly content replacing the PSU myself if that's an option)?
Thanks for any help.
iMac G5 Mac OS X (10.4.6)

Jonathan--
Grep'ing through the system.log reveals lots of:
AppleSMU -- shutdown cause = -122
Yep, when my power supply failed, I got those, too. And, like yours, it often happened when it was idle, though it happened a couple of times when I was right there. When I first took it into the Apple Store, they were hesitant to do anything about it, since they couldn't get it to shut down "on command". It was only after I discovered that if I ran the computer for a while and got it good and warmed up (iTunes with the visualizer is a good way), then shut the computer down, it wouldn't restart until it had cooled down. When I could show them that, they replaced the logic board and PSU.
If you get a clean shut down and startup, you'll see this in the log:
<pre class="command">AppleSMU -- shutdown cause = 1</pre>A "warm" reboot shows this:
<pre class="command">AppleSMU -- shutdown cause = 2</pre>Unfortunately, those codes aren't documented. Even the techs at the Apple Store didn't have them.
charlie

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