I need newbie direction in order to dual boot FC6 with XP.

My configuration is two 40GB HDD. Disk 0 has XP on it and Disk 1 has Fedora Core installed. No matter what, though, my computer continues to boot into XP. I never get prompted by GRUB to pick an operating system.

I know my way around disk management in XP but I'm totally green in the UNIX/Linux world so be kind