hi my daughters have computers 1pc 1laptop recently the sound went on both computers within weeks of each other when i go to "sound,speech,audio"on control panel it says there,s no audio devices.i'm wondering if a button has inadvertently been pressed or if there's a download to get the sound back on these computers.any ideas thanks

What is the make & model of the computers?

packard bell easynote 5255 laptop not sure about the pc go it from tiny!!