I assume this is the problem but when I restart my tibook I'm often left with a backlight screen that does nothing. I think it's a hard drive spin up issue since when I hold down 't' it seems to coax the drive tie spin up and the system boots normallly. But not without this step. System is running 10.4. What software allow me to diagnose the drive further? SMARTReporter hasn't reported anything of interest.