My Pismo 400mhz workhorse goes to sleep when idle for a short time and won't wake up. The screen just freezes and the curser arrow is not visible. Sometimes playing with the keys wakes it up, most times I have to push the power button and restart. I have upgraded the RAM to 1GB and the two memory modules are not a matched pair, but both are recognized and counted up by the OSX Panther I am using. Any ideas? I have sleep mode turned off in the software.