Macbook air 13 inch 2012 doesn't recognize external monitor...

Hello everyone I'm having a slight problem with my macbook air and I was hoping that someone here could help.
I am using a Thunderbolt to HDMI adaptor to connect my Macbook air 2012 13 inch to an external monitor. When I connect my computer to the monitor my computer doesn't recognize that it is infact connected and acts as if nothing is connected.

I followed the steps on the link you provided for resetting the SMC and also did NVRAM reset but now, when I open the lid, it doesn't come back up, instead it just beeps 3 times and never comes back up. 
Not sure what to do about this now.

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