Thanks Macwork. It's the 2nd G-4 of that genre and they both were flakey.
This was the replacement for the first one. I think it has to be something like intermitent hardware. I took out the internal usb hub and it acted much better good for a day then it comes in droves of freeze-ups, please restart and occasional kernal panic. All ram has been replaced, additional hardrive acts strange on both, both stripped and zeroed with fresh os installation. It's a great work station for photo printing as my imac g5 goes on the photoshoots. Is there a hardware test for the power supply? Both Techtool and the disk utility give it thumbs up on the hardware test. Any screenshot that would indicate the problem? Thanks again!