Hello my name is Colin from (UK) i also have just got an Amstrad ppc640 just for messing around on.... but it doesn't have any operating system on it and won't recognise any disks as when i boot it up it always says invalid system disk... i am using both 720k diskettes and have tried 1.44meg and tried putting all dos versions and windows 95 onto it.... any advice would be most grateful.... Yours... Colin E-mail ---- GColinwg(a)aol.com