I had the same issue with mine and was trying to find a cheap unit on ebay, unitl one day I decided to replace all the fuses that could be related to it. I think I replaced about 3 and one of them helped, it came back ON and I could not believe it.

Try it, its worth a shot. I was very suprized and since then I never just look at the fuse anymore I replace them and if it doesn't help I have a spare.

I really hesitated to write about this b/c many people wont buy it, but here it is, try it if you want.