Exactly one week after the warranty expires this refurbished HP 6300 died. Neither the seller or Amazon refused to offer any help. I can not understand why Amazon allows third party sellers to rip off their long time customers. Do yourself a favor. Find another Seller. They do not offer any help on computers once the warranty ends.Update: the RAM sticks were bad. I replaced them with new ones. It works now but Amazon allowed the seller to sell computers with Win pro OS with no product key. Seller refuses to give me a working key. Avoid this seller!!