I have a HP P6000 desktop running windows 7 home I have 8 USB ports 6 on the back 2 in front only one port in the front works and that is only intermittently it will just stop working and if I un plug an plug back in it says USB device not recognized I have tried all I can think of uninstalled the drivers and reinstalled tried updating drivers called HP support that was useless I'm lost all ports say in device manager that they are operating normally and all ports give power to my speakers but anything other than being used as a power source they just don't work just the one in front works when it wants too please any help would be greatly appreciated