Why did my Yamaha motif xf8 suddenly went off while I was playing and won't come back on?

by Kennykehs
(Washington DC US)

I was rehearsing like I always have and just like that my motif went off and wouldn't come back on. I have tried unplugging and re-plugging to the electricity but it's not coming on. When connected to an amp, I can hear that there is power going in. No light is coming on though on the piano...what could be the problem?