New Kaypro Success and then Woe

I scored a reasonably good condition KII on eBay last week, which booted but looked like it just needed some CRT adjustment (screen was garbled, but in a small line at center, which suggest a simple pot tweak). Sure enough, got it home, plugged it in, popped the lid, adjusted the pot, and intro text. Used teledisk to make a boot disk, and the machine booted! Since I had it open and I was trying to check on the drives in the 4, I disconnected the internal drives in the II and connected a K4 drive. On power on, the drive did not even spin up, and so I pulled another Kaypro to test. Does the Tandon use different voltages? Now, tonight, I boot the unit, and the drives spin up but the activity LEDs won't light up on init, and it obviously won't boot. A spare tandon SSDD behaves the same. It appears the drive logic on the main PCB is not operational now, though I can't imagine plugging a DSDD from a K4 would mess things up that much. Any ideas on where to start looking? Jim -- Jim Brain brain at jbrain.com www.jbrain.com