Buyer beware.  This computer does not have a VGA or DVI port to attach a monitor.  Apparently Acer expects everyone to have a monitor that has a HDMI port.  Unless you've purchased a new monitor in the very recent past, you have a monitor that only has VGA and/or DVI ports.  If that is the case, you will not be able to attach your monitor to this desktop which renders it useless.  Back it goes.