I've tried reading through all of these threads and I'm pretty sure this hasn't been answered yet. I'm having the same problems that kiddosr was having in the forums back in Jan of 2011 (I'm new so I can't post a link yet) I have a 2006 Mac Pro - 32bit EFI. I have 4 drives and am attempting to Boot Camp Windows 7 onto the non-OSX system disk. All drives are 500G and use GPT partition table (I can't dedicate one to Windows yet) 1) I had to re-burn the Win 7 disk because of my Mac's inability to see multiple partitions on the install DVD. no problem 2) Windows 7 wouldn't install - I had to pull all of the drives except for the destination drive - no problem 3) Win 7 loads, it's pretty. I run WinLoader 2.1.5, go with the default values and install. No errors, so I reboot. 4) Here's the problem - I get the good ol' grub error screen and the "Boot Failed" message. I've tried various combinations of the Boot Loader options and they just don't seem to work. Can anyone point me in the right direction?