No Sound On if Multiple HDMIs Plugged In

[Byrdbrain]

I have an Insignia 42" TV with a Comcast DVR/Controller and a Samsung BluRay.
If I plug only one of the items into either HDMI port then everything works fine but if both are plugged in then whichever is plugged in to HDMI 2(only 2 HDMIs on this TV) has video but no sound.
 
Anyone have any ideas?

 

[LoweTek]

Sounds like HDMI sync issues. If you select HDMI 2 and there is no sound, try turning off whatever device is connected to it, wait a few seconds and then turn back on. Try this for both the device and the TV separately, e.g. leave the device on and turn off the TV for a few seconds. Also, make sure the device on HDMI 1 is turned off when you are using HDMI 2.