I've read some reports that people are getting a black screen on startup. They see the backlight on, but the screen isn't responding. Sometimes, the buttons don't even respond. Personally, this doesn't happen that often and I only ever have to press the power button once to put the device on standby, and then one more time to bring up the lock screen. This doesn't happen on my dell laptop (which used to run Windows 7 until Windows 8 came about). But perhaps this recent Windows update fixes it?
Screen turns black when it rotates from portrait orientation to landscape orientation in Windows
Screen turns black when it rotates from portrait orientation to landscape orientation in Windows