I woke up this AM to find that I had left my K2600 on after a session last night. To my suprise, today the keys/sequencer, etc produce no sound! At first I thought it may be my mixer, but all is well there. I then put headphones into the K2600 to see if there was sound there. There wasn't.

Can anyone suggest some troubleshooting steps that I can follow to determine where the signal is?

TSpoonE