I decided to put Ubuntu on my old PC that is running windows xp, I found an old HD laying around, formatted it and installed Ubuntu. I wanted to make them separate so I installed in completely separate on the "new" HD. Now when I turn on the computer it goes straight to windows. How do I get the choice to boot into Ubuntu?
You're going to have to mess around with the bootloaders. I would look into installing Grub on the main HD. Perhaps making the ubuntu hardrive the primary drive. And then manually editing the grub config (via the command, not gediting the file) so grub is aware of the windows partitions on the other HD