[ubuntu] Boot Order Change

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http://ubuntuforums.org – Hey, everyone! My problem isn't actually in Linux, but most people here seem to be pretty knowledgeable about computers as well, so I figured I'd ask. I run Windows on my main hard drive, but I installed Ubuntu 9.10 onto my external USB hard drive. I've tried GRUB in the past, but it messes up the Master Boot Record on my computer, so now I just want to figure out how to boot to Ubuntu without making it my primary boot device. I can enter the bios and change the boot order by moving my external HD ahead of my internal HD by expanding the +Hard Drive option using the enter key, and everything seems to work fine. However, when I press the escape key at the startup screen, I can see my boot options, and the hard drive is shown as "+Hard Drive", but hitting the enter key just selects whatever the top drive is (that I set in the BIOS options). Does anyone know how I can expand "+Hard Drive" so I can boot to my external without going into the BIOS, changing the boot order, and restarting? I'm running a Compaq Presario R4000 with AMD64 Athlon 3800+. My bios is PhoenixBIOS. Any help is appreciated. Thanks, Andy (Hardware)