I purchased a PowerBook G4 17" 1.33 GHz for parts that was missing the battery and hard drive, and did not come with the 65w adapter. When I plug my 45w adapter in and attempt to turn it on, it does not turn on. I have read that this is because of a dead PRAM battery? Is there any way to test this computer without purchasing a new battery and possibly adapter? Also, are the coin cells for the PRAM battery replaceable?