Been having a problem with my iBook for a while now. Sometimes when i take the charge cable from the iBook, when fully or partially charged, the computer immediately turns itself off and will not restart unitl the power cable is reentered (even with a full battery etc). This will then have to stay plugged in for upwards of 10-15 to solve the problem.

It sounds like there are power problems inside your iBook. If the power adapter only glows green then you know this for certain. It should glow amber when the battery is charging. You can also test you battery's capacity by flipping the computer over or just looking at the bottom side and pressing the button somewhere on the battery face. Little LEDs should glow indicating the battery's current charge with more lights indicating a larger charge. If this is not the case and the computer is still under warranty I would recommend having an Authorized Service Center look into fixing it. Generally this problem is a bad DC-in board (where your power adapter plugs into the computer) but on rare occassions it might be either the battery or logic board itself is bad. Good luck!