Need Help with A Home Theater Problem. Emergency. Only Experts Please.?

Illmatic

New member
I have a problem with my output in my theater system, sony vaio eb290x connecting to panasonic projector. I have many avi and mkv files on my laptop. I usually try to connect from my laptop to my audio system, which is connected to the projector, via HDMI. I'm not good with this stuff. So the problem is when I play it straight from my laptop to the projector, i get full video quality but the sound is absent. AT first the audio is fine but after about half a minute, the sound completely goes away. I dont have any clue how to fix this so any suggestions are helpful. Thanks in advance.
I connected my laptop to my projector with a HDMI cord. I stated this above
 
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