The topic basically sums it up. I have a HP pavilion dv4-1435dx and I've downgraded from Vista (factory default) to XP. I have no sound. When I go to Control Panel and then to Sounds and Audio Devices Properties where the device name should be (I'm guessing) it reads "No Audio Device". According to the Device Manager everything should be working perfectly, i.e., there are no yellow exclamation marks and I can't find any unknown device. I've been trying to solve this problem for a few days and I've been looking in forums but I still haven't found a solution. Suggestions? Thanks!