When you buy refurbished, you expect the product to work.  Sadly, this was not the case with the computer I bought.Rather than complain and ask for a refund, I contacted the seller and explained my problem.  He sympathized and sent me a return label for examining the device.  To our surprise, the computer worked at their shop.  But before sending it back, he decided to make some last tests and he discover a problem with the power cable that happened only when it is placed in a certain position.He then replaced the power supply and sent the computer back to me.This is a fine example of dedicated customer service.  I strongly recommend them.