I had it on charge overnight woke up and it had tried to reboot it self. Now it is stuck on the logo screen. I have tried holding the power switch for 10 sec, to try to get it to reboot. It goes through the motion , but just won't go passed the logo screen
Swipe up on the logo screen... comes picture password... then you might look if you still have network connection... it began this way... for me.
You can longpress the upper button and shutdown/restart... but the device is responsive to gestures if the booting reached 100% so just swipe up as said above.
Workhorse: BlackBerry|Q10, SQN100-3, OS 10.2.1.2941; Power Workhorse: BlackBerry|Passport, SQW100-1, OS 10.3.0.675; Germany.