I recently installed Ubuntu 12.04 LTS on my 2008 MacBook and removed Mac OSX completely so that it would just be Ubuntu. At first I was having issues with booting. I would have to hold option/alt on startup to select the disk to boot to. I eventually fixed that by "blessing" the disk in the Mac OSX install dvd with
bless -device /dev/disk0s2 -setboot -legacy -verbose
and it worked. The problem is I had decided to partition my hard drive and install linux Mint 12 on the partition. I finished installing but now when I start up the MacBook, I can't boot from either of the partitions. Even if I hold option/alt on startup to select a disk, nothing comes up. I tried blessing one of the disks again but it doesn't work now. The only way I am able to boot into either of my operating systems is by inserting the Linux Mint dvd and selecting "boot from local drive.." Is there any way I can fix this? I have next to no idea what I'm doing and I would like to be able to boot to one of my operating systems without having to use a DVD.. Please help.