Unit came on time and was well packed. Connected it to my monitor and the keyboard and mouse. Plugged it in and powered it up. An error message on the monitor screen read " Power Supply Fan Not Detected ". I looked at the power supply and discovered a blade on the fan was broken off and lying at the bottom of fan assembly causing it to jam the fan so it wouldn't turn. I called tech support and was told it was the last one they had and I should send it back and request a refund. I was pleased that it was so easy to return the product without any cost to me and I received my refund in a timely manner. Thank you Amazon.