Doesn’t happen very often, but sometimes your Kindle DX might just “freeze”, where the screen seems to be stuck and the buttons won’t respond. You need to reset it but it just doesn’t seem to do anything.

What to do?

Easy:  Slide the power switch over and hold it for thirty seconds until it starts to reboot. 30 seconds seems like a long time, but believe me, if you don’t hold the power swith long enough your Kindle DX will simply not reboot.