I have the Powerbook G4 (not the brand new one) 15". It came with 512 mb ram so after weeks of sluggish applications, I decided to upgrade. I bought a 1 gb crucial ram (same everything as the one thats in there). It now says, however that I have 1.25 GB ram, not 1.5 GB ram. It also says there is 2 sticks: 256 MB and 1 GB. Why does it think my original is now 256 and not 512? Where did the extra 256 go?