Suggestions why SCSI 80 drive w/ SCSI2 (50) adapter will not spin up ?

[Pete Lancashire]

Host is a HP 9000/382

Copied the orig drive using a linux box, adaptec 2940N and good old dd

Then swapped drives, a unused 9 GB 80 pin with a Chinese 80 to 50
adapter.

Did have to issue a spin up command and then copied the data to this drive
again with dd.

Powered all off, added a motor start jumper to the adapter and put it on the
9000/382. Motor will not start, added a jumper right on the drive, no spin.

so .. any ideas what I'm doing wrong, or just try a different drive ?

-pete