HUD and sound problem

This isn’t affecting me but my friend’s copy of Gmod. Recently his HUD text started getting cut off and the sound from his guns no longer work. But when other players fire their weapons he can hear them. We have no idea what’s going on so we’re just asking for help on here.

And before you suggest it, yes he uninstalled and reinstalled the game.

Has he tried removing all his addons, disabling his workshop addons, and turning off Steam Cloud for GMod?

Yes he has.