Nothing shows up in the display. This has only been recently after a power glitch. The display lights when a call is made or received.

My phone did this well over a year ago. Then, recently, during a snow storm the power in the home begin to surge. Immediately following this the phone quite holding a charge. Then, suddenly one day the display screen started working (first time in over a year) and the phone begin to hold a much longer charge then ever before. I've found that when the display screen quits working now, jiggling or tapping the battery in the bottom of the headset will get it working again. Placing it on the charger results in the display disappearing again but tapping the battery gets it to work.

I unplugged the base unit from the wall for more than 10 minutes. Sometime after I plugged it back in (not immediately)the display re-appeared.