Samsung Syncmaster 2693hm sound issues

Hello all, this my first time using this kind of forum so I hope I express myself adequetely. I recently purchased a new XFX GTX260 for my computer. Since installing the latest Nvidia drivers my monitor (Samsung Syncmaster 2693hm) speakers have stopped working!! The speakers to my headphones (same jack) and SPDIF optical out work fine! It's only the monitor that is affected - even though it uses the same jack as my headphones which work fine (so it's not the jack!). I've tried using older Nvidia drivers and tested several drivers to my monitor. Nothing helped. Both XFX and Samsung blame each other and can't help me. I can't find any way to get n touch with Nvidia and ask them... To me it feels like it's theNvidia driver but who knows! Any ideas? Thanks in advance.