Sounds like the blown fuse problem many of us have had.

Usually, this is self-inflicted (plugging display cable in misaligned..), but at least two others have reported situations similar to yours, where the fuse just went for no apparent reason.

It's a tiny SMT device. If the unit is still under warrenty, then send it in for replacement (contact David first), otherwise several of us here can give instructions for test/repair.

Cheers