I'm not sure of what you mean when you say select boot devices, not regular bios. I don't seem to have that choice at boot up. My computer goes to a screen that asks me whether I want to boot up with windows xp or ubuntu. The ubuntu is left over from when I installed an old version of ubuntu. I don't know how to get rid of it. Anyway, what I'm trying to say is after doing everything you suggested, it still won't boot from the usb drive. I really appreciate all the help I'm getting here. Thanks to all.
Ray
Ray