Have the power supply plugged in at the same time - should work. Then use utility programme to repair - takes a while but has worked for me in the past. Word of warning - I also upgraded my firmware and my machine is dead now - it is asking for a font file that doesn't exist - it tells me to run the repair utility, but even reformatting is not fixing the problem. I've even tried to install the old firmware again, but it is still not working.
If you get yours working, could you look at the files on the 920 (use explorer and look in system/font) If there is a font file there, could you mail it to me jamesbb@btconnect.com). If anybody else is reading this and has a font file in their font directory - could you mail it to me!
Best of luck - James
James BB, November 2005