| when it boots and gives you the menu. press the "e" key while it is on the menu
there will be a section that looks like root (hd1,0) change the 1 to a 0 and hit the "b" key. if that doesn't work try changing it to 2. If this works then you simply edit the menu.lst file to boot that drive.
sudo gedit /boot/grub/menu.lst
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Biostar TForce X58 - Core i7 920 - 6GB Corsair Dominator DDR3 - XFX 9800GTX 512MB - PCP&C 750W - 1 X 36GB Raptor, 1 X 200GB Sata2, 3 X 320GB Sata2 - Dual boot, Gentoo Linux/WinXP |