I've been having a problem all day. It all started when I tried to partition my HD to install Ubuntu with bootcamp on my mac. The install froze and when I restarted the Apple logo was replaced with a "do not enter" sign (circle with slash). I've been searching forums for a solution and even tried to run a LiveCD but that failed. I think I need to remove GRUB from my MBR. Anyone have some suggestions/help? Much appreciated.
Did you try booting from an OSX boot disc? Then as it wants to start (re)installing OSX, just stop and go into disk utilities to see if you can restore your OSX partition as the boot partition. I suppose the Live CD you are referring to is an Ubuntu 10.04 cd, right?
Tell me what you've tried already
Did you figure it out on your own ? If so,could you perhaps tell us how you did proceed ?