Not starting except when on SCSI chain

[Christoph Pistor]

Dear list,

I swapped the HD in my PB180c and now I can start up! However, it only 
works when the PB is connected via SCSI to a Zip drive which in turn is 
connected to my Performa 6400. If I disconnect the SCSI cable, I can 
only start from a floppy. Using Disk First aid or the utility does not 
let me see my internal disk. However, when running with the SCSI cable 
attached I am sure its starting from the internal disk. What could be 
the problem?

Christoph