My iBook recently at random times will just shut off and it takes for ever with me messing with the battery(taking out pressing button and hitting the power button) for it to work, my question is does anyone know what my problem is, I also have an after market power supply which sucks but it hasn't done this until recently and even then 3 times in the past month or 2(not sure when it first happened) but it's happened twice today the 2nd time was like 10mins after I got it back running, any help is appreciated thanks.