I swapped keyboards between one 270c and another (one had a bad keyboard) and found that the "new" keyboard works fine in the other PB, except for the well-documented problem of having to hit the keys hard to get them to work. I will follow the recommendations for cleaning its innards and see if that fixes it. For a while. The other 270c wouldn't boot, the HD would spin up but that's all. So after I took out its keyboard for the swap, I removed its PRAM battery which tested at 6.32v) planning to install it in the other PB. Just for fun I plugged in the PB just to see what would happen with no PRAM battery installed and, lo and behold, it booted up just fine. Seems all it needed was a "complete" Power Manager reset: remove regular battery, disconnect AC power, & disconnect PRAM battery for a couple of minutes. No questions today, just a moral to the story: "Don't skip steps." Thanks, Jerry