Grub help?

Hi. I have a working SuSE 9.2 system installed on two SATA drives. Unfortunately, I have run out of room, and need to install another drive on an unused IDE controller. When I connect the drive and try to boot the system, I get through all the normal device discovery stuff in the BIOS and then the system prints out "GRUB" and hangs hard. I _think_ this means the system has loaded GRUB off of the SATA drive (which is what I want) but then GRUB can't find the /boot filesystem, etc. that allows it to proceed. If I disconnect the new IDE drive, I have no problems. Any ideas on how to reconfigure GRUB? Thanks.