Magic mismatch??

["C. Tresenriter" <nunc_stans@insightbb.com>]

I've just done a re-installation of Sarge but on booting up the new
install I'm getting:
hda: drive not ready for command
EXT3-fs Magic mismatch Very weird!

...then goes on to complain about dma timeout

Then:
hda drive not ready for command
EXT2-fs hda1: couldn't mount because of unsupported features (4)

Then:
hda: dma_timer_expiry: dma status == 0x60
hda: timeout waiting for DMA
hda: status error: status=0x58 {DriveReady SeekComplete DataRequest}
hda: drive not ready for command
hda: lost interrupt
hda: interrupt lost
hda: interrupt lost

Over and over....

Where do I begin troubleshooting this??

TIA
Curt