Unable to boot into ElementaryOS on MacBook after PRAM reset I installed ElementaryOS on a separate partition of my HDD.

Not sure what happened but the audio in OSX stopped working after the installation. After trying everything else, I found resetting the PRAM resolved the problem.

However, the boot menu no longer shows on startup. The Linux volume won't even show after holding the option key -- only the Mac volume.

I can see the volume in disk utility but it won't mount.

I've tried:

sudo bless -mount /Volumes/disk0s5


But I get:

No mount point for /Volumes/disk0s5
Can't determine mount point of '/Volumes/disk0s5' 
Could not statfs() /Volumes/disk0s5
Could not determine filesystem of /Volumes/disk0s5


So, ermm…, I'm stuck.

How do I get my boot options back?
Just reinstall rEFInd http://sourceforge.net/projects/refind/

This way this runs before Grub which seems to not work very well to boot the Mac OS side of the system