I, too, have this issue. Last year, around December 2013, I was successfully able to plug in my friend's xbox 360 and play Call of Duty on my laptop via HDMI. However, recently, I tried to use HDMI in port again, but I couldn't get it to work and it kept stating "please connect HDMI input Device". Today, I had a technician replace the motherboard, but unfortunately, that still didn't work. I don't know why/how this doesn't work, and it really frustrates me since I bought this laptop with HDMI input being one of the bigger appeal.