So I’ve got an 300 MHz Beige G3 minitower, a SATA card from Sonnet, and a Western Digital SATA hard drive. I’ve upgraded to MacOS X 10.2.4 (about as high as you can go with this machine). When I start up the machine with the card in place, no problem – it boots to the OS from the original SCSI drive, recognizes the card, etc.
When I start up with the new drive plugged into the card, it won’t boot – kernel panic, even though I’m not trying to boot to the new drive.
Mac forums haven’t helped – I know this hardware is compatible with my system, I’ve zapped the PRAM and changed the PRAM battery.