The computer came on time and is decent enough.  However when I start the computer it gives me an error "515 Power Supply Fan Not Detected".  I press F1 and the computer starts. I have tried to contact the seller two times. There is no response.  Also the  computer gets hot without the power supply fan and makes a ticking sound.  The WiFi dongle is only 2.4GHz and is kind of spotty - goes in and out.Update: The vendor contacted me. Tried to resolve the problem over the phone. Did not work.  So they sent me a new replacement. It is excellent. The service is fantastic.  I strongly suggest you can do business with this seller. I give 5 stars.