Pavillion g6 has lost audio through speakers and headphones. When headphones are plugged into jack, a humm continuously sounds whether an audio source is playing or not. Tried 1) restoring comp. to factory sett. 2) default of BIOS 3) Refreshing Comp 4) Uninstall and Reinstall of driver and apps through Windows Utility 4) uninstalling update KB2962407. All attempts failed to restore audio. HP Pavillion g6, Windows 64. Please Help and Thank you!!!