How to reinstall windows on a dell insiron 6400? I have changed the hard drive on it, and now I want to re install the operating system (windows xp which i have the CDs). I am getting a message “’no bootable devices -- strike F1 to retry boot, F2 to setup utility Press F5 to run onboard diagnostics”’. When I press F 1 i get the above message again. I also have an eternal dvd Room which i use for this laptop because the internal one does not work. What should i do?