After purchasing and sending back two Ultra-Slim 8300s which wouldn't boot up, I was a little hesitant to try a third time.  This particular computer is the same small form HP 8300 , tried and true, I've been using for several years.  The third time was a charm.... started right up and seems much faster than my older versions, with its SSHD.  My only problems at this point are making the adjustment to Windows 10, which I put off until the absolute last minute.  This computer is quiet and fast... so far.