1.8 20" iMac G5 Standard 4 port Belkin USB 2.0 Hub keyboard, mouse, cannon scanner and printer plugged into hub, powermate plugged into keyboard. When waking from sleep (This only happened twice) computer froze fans came on full blast. After hard reboot, no response from Keyboard, Mouse or powermate. Unplugging the hub and plugging it back in wakes up all devices. Is the hub defective, is it the model or do all USB hubs act this way?