I've launched into X using
startx, but now can't shutdown my pi, as I have no mouse, and I can't seem to access anything with the keyboard alone. What can I do?
Try pressing Ctrl+Alt+F1.
This will switch you to a different tty. After logging in on this you can run commands as normal
Any F key under 6 will do.
Which is the same as Windows - if you've not got a