The eMac for awhile has had issues going to sleep. I normally log out (or the kids do) and then select sleep. It starts, then wakes back up. Sometimes if you say "sleep" about 4 times, it finally will. I thought something on the USB hub might be waking it up - but it does it randomly when that is disconnected too. I've had some flakey issues with the USB side - but nothing that i can repeat to call and log a call about. Nothing changed after a format of the hard drive and reinstall of the OS either. It is under Apple Care until December, so if it's a hardware issue I'll be covered... i just don't know what to try - or what they might suggest! Thanks for any input - Tracey eMac G4 1.25mhz, 1gb ram, 10.4.8 - if you need anything else let me know. oh the hub has USB hard drive, card reader, wacom tablet, 2 printers on it.