My 1995 E320 wagon wont start for some reason.

It was driving and running perfectly before hand with no history of not starting.
then after parking it for about an hour, i go to start it and nothing happens. battery is not dead. but starter wont engage and there is this buzzing sound from the driver side speaker area of the dash.

any help is appreciated. thank you.

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Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"