Hmm, reading that last post makes me wonder if your power supply is becoming marginal with age. Those old 40 meg drives suck huge amounts of power whenever they do, well, pretty much anything involving mechanical action, whereas a modern device like a SCSI2SD, with its more efficient electronics and no moving parts, will draw substantially less. If swapping the SCSI2SD into the internal drive bay causes the computer to suddenly become reliable, I’d call that a pretty good clue! Please let us know if that works.