When I take out my battery, but leave the adapter plugged in, my MacBook Pro (2007 model) won't power up. Also if the battery is in, but on very low charge, it doesn't power up too. The battery does charge though. So my logical conclusion is that power doesn't go directly into the computer, but only through the battery. Anybody has any ideas before I go to the Apple service? I don't have a warranty anymore and service in Europe costs a fortune. Thanks.