Upgrade to 10.10.2 worked, now disk is not seen as bootable?
Mac Pro (Early 2008)
I started with my Mac Pro and multiple drives installed internally. Two of those drives were bootable, one with OS X 10.5.8 and another with OS X 10.6.8. (I need the older OS for the sake of one lingering application which I need and which cannot run on newer OS's)
I updated the disk containing OS X 10.6.8 to OS X 10.10.2.
I was running this machine from the updated OS successfully for a day or two. I was able to shut down, restart and continue without any issues.
Here's where my trouble began (as I understand it).
I opened System Prefs and chose the older (10.5.8) disk as startup, then restarted from that disk successfully. I worked with the machine for a while then proceeded to try and switch back to the newly updated (10.10.2) disk. When I opened the Startup Disk control panel it did NOT show the drive which contains the new OS, only the disk with the older OS (currently running the machine).
Since then I have been unable to get this machine to recognize the disk which I had updated to 10.10.2. It never shows up as an available option in the Startup Disk control panel. The drive IS mounted on my desktop and I can access it, but it doesn't present as an option to start from.
I've run Disk Utility on the updated drive and it reports that the disk is in good condition, no issues.
I'm not sure what to do next. I'm imagine I could wipe the disk entirely and start over again from Snow Leopard but I really don't want to go through the lengthy hours required for reinstalling my applications and such. I do have my data backed up so I have no worries in that regard.
Your suggestions are greatly appreciated!
PS - I did search this forum for solutions but could not seem to find any.
Is this a good question?