I'm replacing the hard drive on a PowerMac 7600 and I can't get the Mac to see the new drive. It's a Seagate ST15150N and it's got more jumpers than I've ever seen. None of them result in the Mac seeing the drive, however. I pulled up some data on the drive online and apparently I shouldn't even need to jumper it--but it works equally bad without a jumper. The drive spins up and it has OS 9.1 on it--so if the 7600 would see it I should be able to boot from it. If I boot from an install CD, the disk utility won't see the new drive either. I've never dealt with SCSI drives before. Is there something basic I'm missing?