The computer sent did not match the listed specs. "4GB DDR3 memory (expandable to 16GB, 1 unoccupied slot)."  This system shipped with two 2GB cards leaving no room for expansion.  It did not ship with a keyboard or a mouse as described. According to this company, one of the RAM cartridges fell loose from simply closing the case.  The computer had booted up once at first so I feared a PSU failure and sent it back for refund seeing how awkwardly this order was handled. I have been charged $44.49 for my time and trouble and my A-Z claim was denied because "the seller cancelled the order."  I am still confused, but not about the decision to buy anything else from this company.