Reset the firmware this morning and the cube began cycling off/on this afternoon. I also have ran onyX on the machine. John >Try resetting the firmware... restart & hold down the Apple-Option-O-F... >at the prompt, type reset-nvam, return, then reset-all, return. That >should help... > >pm >On Jul 17, 2004, at 8:51 PM, John Martin wrote: > How do you reset the power management unit on cubes? My cube cycles off/on (never able to restart) for the past couple of days. I unplug the power over night and no problems for ~2days and then it starts again. I have repaired permissions and zapped the pram. The cube is an original cube with 1.25 GHz RAM, airport card, OS 10.3.4. Thanks, John