Hi , I have an old emachine 4076 i am looking into replacing the faulty mobo to keep as a back up to my newer system - i was planning just to reinstall XP using the original manufacturers disc but i've read this might prove difficult to authenticate with microsoft . Is this absolutely the case despite the mobo needing to be replaced or might i get a break if i only install a similar model/brand ? If so can anyone please recommend any mobo's ? The original is - Intel Desktop Board D102GGC2 ( 775) Chipset ATI Radion Xpress 200 (+ i PCI slot ) Being an old mobo it seems pretty unlikely to find a direct replacement - so looks most probable that i will need to find an upgrade - the question is ... -is there any chance an ugrade might get accepted by reinstall of XP , can i still find a mobo with the same/similar chipset or just go for a generally better/more modern mobo/pcu as i will have to invest in another OS ? Also - as this is only intended as a backup i intended keeping as much of the old set up as possible to keep cost down , so reusing things like the recently purchased 2 x 1mb DDR 2 RAM (533mhz) - will i have to forget that or can i get a mobo/cpu compatible to this RAM ? Any advice / recommendations appreciated .