OK, so I got my HP desktop windows 7 PC connected with an HMDI cable to my receiver.
Whenever I put my receiver on standby and turn it back on, I will still have picture but the sound is gone. Clicking on the Speaker icon (which shows a red cross) on the bottom right, it tells me that the HDMI cable is not connected.
When I restart the PC, the sound is back again.
Now I'm wondering if there is another way to get the sound back. Maybe like rescanning if the cable is connected.
That said my limited experience with HDMI on my devices is it many times requires cycling the devices to get them to talk properly. In fact I many times have to cycle my receiver when streaming a video from my PS3 because the audio becomes garbled right in the middle of a show.