This is a known issue with the Alchemy logic board design. Apple created the fix for internal IDE drives, and Power Computing created the fix for internal SCSI devices. The following chart should help elucidate.
Internal PowerSource
Startup Device Use This Now Source Future Fix Article
-------------- ------------------------- -------- ---------- -----------
IDE HD 6360-64xx-54xx Update 1.0 Apple ? 1287
SCSI HD SCSI Manager 1.2 PCC FWB V2.05 1437
Machines Affected: PowerBase