I picked up a 400mhz TiBook "for parts" recently off the LEM Swap site...I couldn't pass it up for the price, especially since it included the original "yo-yo" charger. In any case, the seller said that it would do nothing when attempting to power it up, something which I can confirm. It's too nice to part out, though(the top lid is nearly perfect), so I'd really like to get it working. First of all, I disconnected the PMU battery, as I know that having a dead battery connected can keep some Apple laptops from booting. Some further diagnostics have lead me to think that the DC in-board is likely bad. The seller told me that the battery was bad, but it's charging fine in another TiBook. I've tried installing a charged battery from another computer in this one, but it won't boot off that either. Does anyone have any suggestions for further troubleshooting?