i don't know my computer was working nicely and i suddenlty press the f11 while restarting my pc and than everything went black it start but after showing hp invent , a blue screen appears , *** the hp company everything is worst of this company , my expection were higher with this company , but now i will never buy this comapny product, many problem like computer get too much heated while running , fan make alot of noise hp service centre of china is the worst place , i will curse to this hp people