I have a 95 E320 with 238,000+ miles on it. The other day I was driving home and I lost the gauges in the dash and had a faint buzzing sound in the dash. I pulled into a parking lot and turned the engine off to check to see if I had blown a fuse. NO fuses were blown but when I turned the key to start the car, nothing happened. Everything else (electrical) on the car appeared to be working. Any thoughts?