Hello, my ibook G4 12", 1,33GHz, mid2005 immediately shuts down, if I click on "go to sleep" in the menu. It is like having no battery in and pulling the powerchord out of the wall. No process of saving files or anything, before it shuts down. (EDIT: I can see the sleep light lighting up for a tenth of a second) If I change the energy setting to 1min and I wait, in order to have it go to sleep on its own. It goes black, no sleep light (even not for a milisecond), but I can hear the HD still moving. When I hit the track-pad, it wakes up (remember I did set the computer to 1min sleep and not only the monitor). BUT! As far as I remember, you always had to push a key or the trackpad-button to wake it up. Wiping with your finger only made the screen awake from sleep, I thought. PMU reset does has no effect. The ibook stays dead. One of the two things help always, to bring it to life again: 1. unplug the power chord, pull out RAM wait, insert RAM, plug in powerchord and start (if option 2 does not work) 2. plug out power chord, pull out battery, wait. put battery in, conect power chord, start. My old ibook got broken through an accident. I purchased a "new" working one and put my old case(including display case) around it and I changed the HD to a WD3200BEVE. I first thought it is the new HD, because external WD drives sometime have problems with waking up. But I started the ibook from an external old Seagate via firewire and then clicked on "sleep" and it shut down the same way. Could that be a hint, that it is the logicboard and not the HD?