Pure conjecture on my part - but it may very well be a wattage issue. My current power supply (used for my 15" 550) is rated for 45 watts. What is your new supply rated at? On Thursday, May 8, 2003, at 10:52 AM, Simon Chapman wrote: > My previous TiBooks (400, 550, 667) came with a variety of puck- and > cube-shaped power adapters, all of which - according to Apple - were > interchangeable. But the manual with my new 1Gb 15in TiBook states that > previous TiBook power adapters should not be used with this machine. > Anyone > know why -- or is this just Apple being over-cautious to protect > themselves? TIA.