Hi, I'm using a Dell Precision M6500 on Windows 7 and there is no sound. It seems to have happened after installing Borderlands, and only Borderlands and Skype would have sound, nothing else. I tried reformatting and now nothing has sound. Device Manager says that the sound card is fine, I tried rolling back the driver, no sound. Then I updated to the newest driver, no sound. Then I plugged my computer into my TV via the display port and the sound runs perfectly through there. I am thoroughly confused. Any help would be greatly appreciated.