SV1 - 73 black/red not turning on!

[SoundApe]

My SV1 just sits nicely in my studio and is (was) played every other day as a piano and a controller.
I went to turn it on one day and nothing!!

I've checked the power lead and this is fine. Any ideas on what this could be or what I can do next. I'm gutted. I love this piano and kind of expected a longer life for the price I paid.

Any help/advice would be greatly appreciated.

Andy