How do I get round this? I fired up my other PC this morning, having hibernated it. The 'Restoring state' screen appeared, the progress bar at the bottom ran across the screen, and then nothing. I switched off the PC, then back on, and it booted to the System Restart menu (the one that offers to delete the hibernated data and boot from scratch or try to restart again. Here's the kicker - I use a Microsoft wireless keyboard, the drivers for which aren't loaded until Windows has started. So I can't do anything with the menu - I can't change the selection with the arrow keys or accept the selection with Enter.
I've tried plugging in a spare USB keyboard and rebooting but it doesn't seem to get recognised and I've no response from the menu.