bought a broken one?
pretty simple pedal...my favorite tuner right now...
plug in the RIGHT side (the input)
lights should flash
press again an you can tune.
other than that, it's broke.
and Korg won't do anything but tell you to buy another one.
Mine has a broken battery door, so I contacted them to see about getting a new door, they told me to send them a receipt (i bought mine used too) and they would just send me a new one.
no receipt, no new door, lesson learned, don't put velcro on the battery door!