HDMI output on Inspiron 580 not functioning

Hello all,

Having a problem and have run out of ideas. I was hoping someone could point me in a new direction. I will try and be as discriptive as I can, let me know if you need additional information.

I am working on a new Dell Inspiron 580 desktop computer (windows 7) for a friend. It has a HDMI port that is part of the Intel H57 chipset. We are trying to clone the display first to a Samsung SyncMaster B2330 Computer monitor using the VGA out. Second, we are trying to send the signal to a Samsung UN46C6300SFXZA (an LED HDTV) using the HDMI output of the Inspiron to HDMI input on the TV. When using the "Intel Graphics and Media Control Panel" to clone the displays under the "Multiple Displays" section it appears that we are not getting a signal at the TV. The TV displays "No Signal - Check connected devices, power cable connection, and source selection". I am sure that the input selection on the TV is set correctly

Here are some things we've tried to no avail:

1)Tested the output with a 2nd HDMI cable
2)Tested output with a 2nd TV (although this TV was also a Samsung)
3)Updated the Chipset drivers, downloaded directly from Intel (the file was "WinVista7_64_15173" )
4)Upgraded the BIOS from A03 to A04
5)Endlessly played with multiple configurations in the "Intel Graphics and Media Control Panel"
6)Restored the computer to the Dell factory default settings. This erased all user changes.
7)I've contacted both Dell and Samsung technical support and so far have not found a solution.

I am out of ideas. One thing that I'd like to do that I don't know how is to test the HDMI port on the computer with some sort of software diagnostics. I haven't found anything like this in windows and was wondering if anyone knows of anything like this. A hardware tester is something like $300, a bit out of our price range. I would really like to get this HDMI port working - it was one of the main reasons my friend purchased this computer.

Any help would be greatly appreciated, thanks!