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You need to activate the HDMI output port on the laptop. By default it is inactive at start-up. Look for a key on the top row marked "LCD/CRT" or "HDMI' it's different on every brand of computer so I can't identify the key on your exact laptop. Press that key and the Function key (Fn) at the same time. That should activate the HDMI port. You might also need to change the sound to HDMI in the Control Panel Audio tab. It may also need to be change again if you want the internal speakers or earphones to work. This should be in your Manual somewhere.
try to restart your laptop and after you connect the HDMI cable. That's what I did with my Gateway NV79 laptop.