You need to measure the output voltage from the power supply, the blackbird power supplies have known leaking and failing capacitors. I had a blackbird back in the turn of the millennium and the caps were already bad.
Unplug the power cord from the brick itself and give it a sniff. A good one. Bet you smell fishy fishy.
The other thing, 2.5" SCSI HDDs are KNOWN for spontaneously failing.