I don't how see returning it for a third computer will fix anything. I don't think it's a hardware issue, and I don't think you got two duds in a row. The HDMI port is clearly accepting inputs, but just isn't displaying it properly. It's probably a driver/graphics card setting issue.
Yes, maybe the Nvidia card will be different, but I would fiddle with the AMD to try and get it working - I wouldn't be surprised if the the Nvidia needs tweaking as well before it displays correctly.
Personally I would ditch the Alienware and look for another solution. Alienware = bad value and overpriced.
You're throwing a lot of money at something that could (IMO) be solved cheaper.
That thing has at least got actual OSD display controls, accepts more inputs, is a smaller profile (folds up), can run off internal battery (longer than a laptop), less heat, etc. And it's certainly portable.
But hey, its you're money...
Edited by chicolom - 4/23/13 at 7:08pm