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Yeah I have two different power adapters, an original Apple and a modern replacement.  Same on both.  :/

I didn't swap the logic board as well - It's worth a try though.  Will report back.

Okay you're going to love this - so I bought a second 170 to use for parts; specifically to swap out the daughterboard on the theory that it has some defect causing the repeated chime.  It arrives, I swap them out and - same thing.  No memory card, no HDD, just by itself. Given that, any...

Well I tried it again with the HDD unplugged (and the memory board out) but same thing. If I get a logic board replacement I'll update the thread  :)   Meanwhile if anyone has other thoughts please let me know.  Thank you!

Well two things happened: 1) I found the multimeter, and 2) a replacement AC adapter arrived, as I hadn't found the multimeter yet.  Go figure. Anyway, the short version is - same thing.  There's a staticky click before the chime as the speaker is engaged that makes it sound like a record...

Thank you for the points to try.  I have unfortunately been unable to find my multimeter yet (It's either here or there but when I checked it was neither). I did remove the memory and try booting holding down the daughterboard near the connector; then as it kept chiming I tried pressing on...

TL;DR: Powerbook 170 boots to checkerboard and repeated chime, about 1s apart, doesn't stop. Backstory: Got this powerbook 170 off of ebay for "untested/as-is" for cheap, no power supply.  (For reasons, I thought it might work.)  Got a power supply.  Plugged in - nothing, no . . no nothing. ...