Korg C-320 won’t turn on

Korg C-320 will not turn on. Got new power supply unit and still no go. Anyone have any ideas? Had been working great but was sitting idle for several years. Tried to use it and it’s dead. No visible damage anywhere.

Hi, just to be sure … did you get the correct AC/DC adapter for it … what secondary specs has it got - DC Volt and Amps ? I think they are running on 24VDC … I can get C-520 SM but I assume C-320 being same …