The new 90 degree magsafe chargers do not work on some of the older macbook and macbook pro machines without a firmware update.
However, the firmware update requires 10.5 or higher. So it will NOT work for Tiger 10.4.
The firmware can be downloaded from the Apple site here for both Macbooks and Macbook Pros.
photo from: http://store.apple.com/us/product/MC556LL/B