Either something isnt actually charged up (my guess would be the plane), or you have an open circuit such as a bad switch on the plane or something has come unplugged. It may sound dumb, but you might have actually left the plane powered up all night, it went dead, and today when you turned it on, you actually switched it off instead. It happens!
Check all the connections on the plane first assuming you have a lit indicator on the transmitter, whether a power light or LCD readout on the tx.