F12 Grub loading error message on a macbook pro 5,1

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http://forums.fedoraforum.org – I'm dead in the water with my MacBook Pro 5,1 with the following message Grub loading. error: unknown filesystem grub rescue> _ (it is hung - I cannot type any commands here) I kind of think its a partition problem, so I'm going to repartition using OSX's disc utility, reload OSX and then try f12 Sigh, I spent the whole night on this with no progress. Another issue is the livecd failed to work, tried nomodeset and xdriver=vesa but these didn't work. The funny thing is that the dvd works - I booted up (with nomodeset & xdriver=vesa), and I was able to install f12. btw, I had no problems with the RC of f12. I may go that route if this fails. (HowTos)