I've forgotten the working power requirement of the 2400, but the adapter will power it...it just won't charge the battery below 36W...or a I expect very slowly. Check out the Madsonline adapters if you end up buying one and can't find Apple's OEM version. It use to sell for $20 from Sun Remarketing, when they have them in stock. http://www.madsonline.com/ http://www.sunrem.com/ >I was under the impression that a 2400 could run on a Duo adapter, >but this excerpt from an Apple document has me confused: > >M7783 (Duo Adapter) >PowerBook Duo 210, 230, 250, 270c, and 280 computers include a 25 W >power adapter. > >M2693 (Duo Adapter) >The PowerBook Duo 280c included a 36 W power adapter that works with >all PowerBook Duo computers. > >PowerBook 2400 >M5937 >36 W AC adapter for the Macintosh PowerBook 2400c computer. > >I have both adapters, 7783 & 2693. Will either of these power the >2400? Or do I need to buy the 5937 adapter. I hope not!! Thanks. Ralph Mawyer, Jr. San Antonio, Texas Associate Editor mac2400 ... http://www.sineware.com/mac2400 Your PowerBook 2400 Reference Site "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Benjamin Franklin, 1759.