My Powerbook G4 is not charging and I'm pretty sure it's not the battery (since I tried another battery and same thing). The ring light is not on either (neither orange nor green). And it's not the power adapter (my first suspicion) since I got a new one and it still doesn't work. When I take the battery out, and have the machine plugged in, it doesn't turn on either. This has happened once before, it stared charging again about 12 hours later. Is there something wrong with the DC-in board or the logic board? Anyone else have this problem?