Why IRT04/05 display goes black while the Tablet PC is still turned on?

A: The possibilities include:

• The tablet might have turned off the display to save power. To restore the display, touch the screen with your finger or the pen.
• The tablet might have gone into Sleep mode. Press and hold the oval Powerbutton for about one second.
• The tablet might have gone into low-battery Hibernation mode. In Hibernation mode, the power status light is off. Plug the tablet in to AC power, then press and hold the power button for about one second.