A short while later...
It does seem that just having the Zune connected will charge the battery a bit. which is good.
However the hard reset is not working for me anymore. Which is really bad.
I can get past the initial loading screen. The bar goes up fast about 9/10ths of the way. Does a last little push. Click click whir of the hard drive and ...blank screen. Nothing. nada.
Plug it back on to charge some more and it goes back to freezing.
I'm not happy.
I curse the self copulation of your lousy record collection