What I found worked for a black screen (I was reading and ran out of battery, plugged it in, waited a minute or two, then tried to turn it on and ended up with black screen) is do to a long hold on -- i.e. hold the power button in the on position. If I did a quick flick of the switch the light would change colour but it wouldn't start (tried that a few times), but when I held it it started properly. Not sure if that was co-incidence or not, but it worked that time.
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