Kindle Meltdown

Closed my Kindle after a cup of tea in the canteen, next time I open it the Kindle is unresponsive, nothing! Plug in the usb power cable and still nothing, laptop doesn't even recognise it. Not good.

A quick search of the internet reveals lots of info about recharging the battery for 30 mins but my Kindle won't connect via the usb.
Then I see a little gem about holding the power button down for 20 seconds. Et Voila! Kindle Reset!
Sad to say I'd be lost without my Kindle :(