PMU problems? Hope not.

I've started seeing this message:

Jul 27 17:45:09 localhost kernel[0]: ApplePMU::PMU forced 

shutdown, cause = -122

I'd like to think it's a faux pas, but I think I'm reaching the physical and technical limits of what my old G4 can do. Tiger will be the last OS installment on this machine until I can replace it.

I've added a new video card (that powers 2 monitors), several hard drives, an firewire audio interface, a USB 2.0 card, and a processor upgrade. So I'm not surprised to see all these problems cropping up.

I'm also having a lot more kernel panics, freezes, and various application crashes. Not sure what to do next.