Hi. I've recently bought a laptop online with no OS installed on it. I've installed Windows 7 Ultimate Edition and downloaded all drivers from the manufactures website. Everything works fine except there is no audio coming through the headphone jack or built-in speakers. I have spent majority of today looking online for answers on how to fix this issue and have found nothing that works. The laptop model is a HP Pavillion dv6-1007tx. Thanks in advance. EDIT: When I plug in a HDMI cable to the laptop, sound comes through my TV.