My laptop decided yesterday that it wasn't going to allow me to hear any sound anymore. It won't let me hear music or anything at all.

I opened up the 'Control Panel - Sounds and Audio Devices' thing and it says 'No Audio Devices'. There are speakers built in to my laptop and I figured that there's a chance these are broken, but it won't let me hear anything through earphones either.

Does anyone know what is wrong with it or how I can fix it?

Thanks in advance.