Mojave won't load - claims that time machine is using my hard disc
This is a Mac mini (Late 2014) running 10.13.6
When I try to load Mojave I get to the HD selection and it will not go further. A flag pops up saying that this HD is being used by time machine. I go into time machine and it appears to be using another HD for back-up.
Mac OS X (10.7.3)