System freeze-up

[Moltke]

That is the output before the system had a chance to freeze.  If I hit Ctrl+Alt+F1 then the only thing that happens is I lose my cursor and can't do anything (much like when the system freezes) and I have to hold down power button to reboot.

Ok, I'll try to explain better this time:
1. By pressing Ctrl + Alt + F1 you'll be dropped to a console; a black screen with a blinking cursor, give it a few seconds and you'll see login type in your username and password, press enter and you'll be logged in a  TTY, you can issue commands from there, navigate the system, and do pretty much the same things you can in a terminal from the desktop, but the mouse won't work while in there, that's normal.
2. In that console run the journalctl command, because the messages you posted are from when you rebooted the machine.
3. It would be better if you did this when the system freezes, just be patient after pressing those keys and wait until the TTY starts, then proceed as explained above.