I had OSX86 running and then I tried adding UBUNTU 8.10. Trying to be safe, I added a second hard drive and put in the Ubuntu installation disk. When prompted, I installed Ubuntu on the second hard drive and everything went smooth.

However, when i restarted the computer, I can only boot to Ubuntu. If I try to boot to the original disk it just says GRUB Hard Disk Error.

FYI, when I say boot to a disk, i choose the start up disk from the bios.