No sound in Garry's Mod!

Like the title says, I don’t have any sound in the game. I’ve tried validating the files, no good. I have no idea what’s causing it, so any help is appreciated.

Look in the sound folder and delete everything there, that should help.

That didn’t seem to help. Any other ideas?

You could try this:
Type “find sound” in the console and see if the cvars are default, especially “volume” should be 1.