Hi,

I used to have the same problem with my previous Yamaha EMX-5000 (12 channels). I turned out the power supply went bad. I took it to Yamaha head quarter in Buena Park. It took them 2 weeks to replace it. It was all free of charge because the unit still under warranty.

I like Yamaha EMX Power mixer series a lot, it is bang for the buck. However, if you have the money...try out the Dynacord Powermate mixer. It has the Midas pre-amp and awesome effects but it is double in price compare to the EMX-5016.

coca