I need help, please.

My 95 E320 (just got it a month ago) will not start. When I turn the key nothing happens. I hear a low pitch noise coming from the engine compartment. It sounds like a fan running. When I go under the hood, the sound is coming from the fuse box and the black box right behind it.

Any help would be appreciated. The wife was driving the car this afternoon and she said all the guages went out, except the speedometer.

Thanks.

Jimmy

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1995 E 320 119,000
1983 300 TD 285,000 (sold)
1973 220D (sold)