Engine not cranking over

I am trying to determine why my car won't start. The condition happened all of the sudden. I thought that it was a result of lack of use and that the battery was dead. I got the battery charged but I still can not get it to start. Not only does it not start, but it make "no sounds." when I turn the key in an attempt to start the car.

The lights work, so does the radio and other electrical items.

I figure that it might be the alternator or the voltage regulator but I have not know them to go out without prior issues.

Please share you opinions as to the problem and possible solutions.

Thanks,

Armond Hankins