Product shipped one day after order. Arrived on day promised. Product is exactly as advertised. The exterior is pristine and the interior looks as if it just came off the assembly line. The computer BOOTED the Windows 10 Pro software  flawlessly ,BUT it would not allow Microsoft to activate it to my account. The only solution offered by HELP was to buy a new license from Microsoft. I contacted Amazon support who were supposed to pass my message through to Greentop. This never happened. After several days I contacted Microsoft and a real person led me to a location in the BIOS where she thought an embedded Product Code should be located. It was blank. I went back to Amazon support. This time the Amazon site stated they did not support computers, but their Artificial Intelligence led me to the only option available which was to return the computer. I did not want to return this beautifully functioning computer. All I wanted was a Product Key to activate it with Microsoft. I clicked on the one star button and logged off. This time the message apparently went through. The next morning I received a call from a real, knowledgeable person at Greentop and within an hour he emailed me a Product Key. I installed, the Key, the computer is activated and I am one happy customer. I went into some detail about my experience because I sense there are some problems in the Amazon Refurbishing Center that need to be worked out.