It's in the last place you would look. Many would suggest you to start looking there to save time, but that would be wimpy. Instead, you should curse out loud for a few hours, turn your flat upside down, go buy a new one, notice that it doesn't fit, solder yourself a custom cable that kills the POD, order a new POD, fire it up, play a few riffs and find out the hiding cable was actually in your left hand.
That's what I usually do. I have actually re-bought several course books for school just to find out at the end of the period that the missing books were in the sealed packages they came in, cause I had forgotten to open them.