My venerable Edge Touring Plus fell off my bar mount this evening onto cobbles. I didn't spot it had gone for several miles but, luckily, it was still there when I went back. However, it won't now start - no reaction to the power button, nothing when I connect it to the computer. I've tried the "hold the power button down for ages" thing. There is no visible external damage at all (it was in one of those rubber impact cases).
Any suggestions? Or, if I open it up, anything to look for that is known for coming loose with impacts?