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Thanks Macdrone and waynestewart. Yep standard troubleshooting, PRAM nvram, logic board didn't make a difference. Just makes sense that the "alternate" bus (the working ATA-66 in use) might be bus 1, rather than 0. Wish I understood more about reading the ATA device tree...

Hi, How can you ID which is ATA Bus 0 ? Terminal? Open Firmware? Disk Utility? Look for label on logic board connectors? Other? Detail: After the "Ultra ATA-100" bus started failing years back (with errors), moved the HDDs to the two Ultra ATA/66 bays. Never had occasion until now to start in...

Thanks so much for the replies and for sharing your expertise. Very much appreciated!

Would someone take a look? Pic is probably a couple of meg in size ("bad" ? circled in red, "good" ? in blue) http://img204.imageshack.us/img204/3443/capsuq.jpg I'm not a printed circuit board level guy. But hanging out here, I learned about various problems related to bulging or leaking...

9.04 9.1 9.2.1 9.2.2 still on Apple's website for 9.0 and up at the Archived - Mac OS 9: Available Updates page http://support.apple.com/kb/HT1387?viewlocale=en_US Unfortunately, never found a way to find useful pages like these through any search engine. I just bookmark them when I somehow...

The more I learn about vintage electronics, the more what you advise seems to be the best practice. As yet I have zero direct experience with component level repair/PCBs. (Indirect experience? When a G4 MDD would no longer respond to my best troubleshooting, the only thing that worked was a PSU...

I recall the 2GB volume limit, and the Apple ROM to format issue, but wasn't sure exactly where System 7 or the IIsi fit into that Apple timeline. And thank you very, very much for the clear and specific SCSI drive and power tech tips. They'll be very useful going forward. (If I'm lucky it...

Thanks for all the advice, unfortunately it took longer than expected to pick up the replacement logic board. Long story short, after replacing the board, the original hard drive still didn't spin up - but a replacement drive worked fine. Now up and running System 7. It also boots fine off a...

Very much appreciate the meter data interpretation. Yes 2 mega ohm - that was a typo. I think it may just be the meter, but in sequential measurements it rested at something as low as 0.5 M ohm or as high as 2 M ohm. Next week I'll have a chance to pick up the external SCSI cases, replacement...

Wow. Thanks for the great suggestions. It's going to take me a while to work through them. My (un-inventoried) vintage Mac parts stash is at another location - and the IIsi PSUs are there too. Know I have more floppy drives. There possibly might even be another logic board to try. But if there...

Glad I found this board. Hope someone point me in a useful direction to get a recently liberated Mac IIsi up and running. Long story short: There may be multiple problems, but number one is the hard drive is not getting 12V of the 12V/5V needed for it to work. After a SCSI drive swapped in...