My wife has a Google G1 phone from T-Mobile and she couldn’t get it to turn on the other day. It was stuck at a screen with the Android logo on the front and pressing any buttons would not resolve the issue. I decided to remove the battery from the G1 cell phone to make sure it completely rebooted.
Removing the battery was a task in itself. There are a bunch of videos to explain how to do this but even with the video it was hard to remove the case that covers the battery.