[[but I just can’t get it to load on this new machine. ]]
There’s got to be a way to do it- it might be that win 10 is screwing up the boot loader/grub- There is a free tool that will ‘correct’ boot problems - the fact that you can get to the grub menu and no further sounds like it’s simply not seeign the linux operating system
You can try Boot-Repair-Disk here: http://linux.softpedia.com/get/System/Operating-Systems/Linux-Distributions/Boot-Repair-Disk-99450.shtml
Or another trusted download site-
Also your grub may be corrupted- try reinstalling it
However, since you can get into grub menu- try follwoing option 2 on this site:
http://www.makeuseof.com/tag/fix-ubuntu-linux-pc-wont-boot/