The item for sale is a used M-Audio Axiom 49 USB MIDI Controller Keyboard. 

I am selling for parts or repair as I don't have the correct power supply for proper testing. 

I did try to test it with the only 12v power supply that I had that the plug would fit however the only result I got was that you could tell the screen had a backlight glow to it and the Null & Zone/Group buttons had a blue LED lit. 

Not sure if this meant it is bad or maybe the power supply I used didn't have enough amperage.