When you say nothing, do you mean the dash backlight comes on but no information (ie. temp, speedo, etc..)?

If absolutely nothing comes on (no dash backlighting), check the contact switch by removing the dash. I believe you can just remove the three screws on the dash and get access to the contact switch.

If the backlight comes on but no information, check the contacts on the fuse box. I had the same thing happen to my MC28 where the back light comes on but no info. I cleaned the terminals on my battery and the connections to the fuse box and no more problems.