My HDMI output no longer work I replaced this adapter USB -VGA that allows me to connect a large screen in 1920x1200 resolution, same quality of display with HDMI, his PC.
Windows 8.1 driver installation via internet manufacturer website (no DVD drive on my ultrabook), restart connection and working. Is set not with the supplied software but with the controls of Windows 8.1 and its control panel which is simpler, at operational in 10/15 minutes.