11-29-2013 10:31 AM
did u have an motherboard exchange lately?
Do you have any unknown devices in your Device Manager?
What OS are u using?
My words are not the words of HP, I'm an HP Support Employee for HP Notebooks. I may help with the right TroubleShooting and give some advise for self repair (only if the Notebook is Out of Warranty). Just remember, the best support is Your local HP Support. Never hesitate to contact them.