I acquired this baby a few weeks ago and it came with a stock CC logic board, 10 Meg of RAM, a 700 MB Qauntum drive, and an Asante PDS LC ethernet card in it. And it came with this issue as-is.

I have since put in a new logic board (LC 575 board), and it still does the same thing.

And that leaves the hard drive the only thing yet to be swapped to test it out (I am not sure how to get to the had drive, looks like I have to remove the analog board to get to it?)

"Or it could just be that your psu is a little low on one of the lines" - replace the power supply?