two distros - only one available
I've been running Mint 13 very successfully. I wanted a second distro to act as backup and so installed Stella.
The trouble is that I can now boot from Stella but when I try to boot from Mint I get 'error 13 press any key to continue' When I press any key I'm sent back to boot from Stella.
Do I have to change something in Grub and, if I do, how do I do it, please.