As a first step I recommend going into every BIOS setup
screen and applying the Default settings. Usually there
will be a Function key you press to apply the default
settings for each BIOS setup screen.
The reason is that if some freaky screw-up has occurred in
the BIOS settings then this behavior could occur without
a single thing being wrong with the hard drive or the data on it.
Visually the BIOS settings can look okay but still not be due to
some freak glitch - power spike who knows...
While I would do this first, I would especially do this if the
drive checked out okay when testing it on another system.
The experience I had that makes me do this first is from an XP laptop
that rebooted prior to the screen offering boot choices. Booting
the Windows install disk and various Microsoft technology based
Emergency Boot CD's would show no hard drive present even though
the laptop was partially booting Windows. Linux based Boot CD's would
see it though. The drive was fine on another computer (chkdsk, fun with
Partition Manager, backing up the data, reformatting, repartitioning, restoring
data, same boot behavior). After an entire day on it, having given up, I
tried resetting the BIOS settings. :D (Because with the unpartitioned
drive installed and Windows Install CD still not seeing the drive, despite
the fact that the BIOS was telling me Brand/Model of the drive on boot,
there was no place left to go.)
Edited by rgreenlee, 31 December 2009 - 08:04 PM.