I bought the kx-p 4420 several years ago for a customer. The never came and got it. It worked except it needed toner and and a devleper kit. I recently was able to get a good deal on the ink, toner and devloper. When I tried to turn it on, I heard the power come on, but there were no lights for the front panel. Is there a way fto fix this. I have have a course in basic printer repair, however, that was about 9 years ago. Any suggestions would be appreciated. Thank You.