Having an issue where the device screen is blank, often after pressing the power button to boot the device, or when trying to wake it up after hibernation. It looks like the backlight comes on, but there is nothing on the screen. Normally when this happens I need to continue to press the power button on and off until the lock screen or login screen finally re-appears. I've seen a few threads on the internet talking about this issue, but have not been able to find a solution. Has anyone here heard of a fix for this?