No hdmi picture

We just purchased 2 new Envy H8-1437c PCs and the both are having the same issue where we can't get a picture through HDMI. They both work with the monitors if we use VGA cables (the pc came with a DVI>VGA adapter). We have two different monitors with both HDMI and VGA options. When the computers are first turned on with HDMI, we can see the HP logo but then it disappears and they stay dark. We've tried different HDMI cables, different monitors including our home TV's, without any luck.
It's odd that we have 2 brand new PC's with the same issue. Is there some sort of switch that needs to be enabled to allow the HDMI to work? I've looked through the BIOS and found one option for display and have played with that without success. Either I'm completely missing something, or these two are bad, or there is an issue with the line. I've checked the support site to see if there were any updates to address this but didn't see anything. We've contacted HP support without resolution.
Before we return these, does anyone have any ideas what I could try?

As an FYI, we just replaced one of the two from the store it was purchased from and it worked without any issues. I guess we hit the statistical anomoly of having 2 machines with the same failure. Oh well. Problem solved and we move on. Thanks again.

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Message Edited by Lewandowski on 05-31-2009 02:29 PM
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