[Ti] Titanium PowerBook G4 400 MHz/1MB Cache 256MB/20GB/8MB VIDEO/DVD Date 21/02/01 S/N QT1080D6J8D

[Simon Royal]

Hi, i have the same powerbook. Upgrading is not too hard. It is not as easy 
as the G3 models. As long as you are careful and remember where all the 
screws come from you should be ok. I know the 400 and 500 models are the 
same except the mainboards so should be interchangeable. One point to 
remember these 2 models use a different optical drive and upgrading it 
requires special mounting brackets. Simon