Whats the best way to diagnose a SCSI error?
[A]: First of all, check that everything on the SCSI chain has a unique SCSI ID (the internal hard drive is usually ID 0, and the system is usually ID 7). If this doesn’t work, try connecting each device on its own, directly to the Mac. Then (starting with a device that’s Ok) start building up the chain until you identify the problem. SCSI chains can be tricky and sometimes the device order, physical order or even the connecting cables can cause problems. You might also want to try adding a SCSI terminator to the end of the chain.