From the service manual:
SW200:
8-RESERVED
7-EXT_TERM
6-SYNCH_MODE
5-LONG_SPINUP
4-SCSI_FAST
3-SCSI_ADR2
2-SCSI_ADR1
1-SCSI_ADR0
When it doesn't boot - do you get a boot prompt screen or just nothing? The former would indicate that your IDE drive isn't flagged as bootable...
