PC HD 1080p - is it possible?

Hi

I have an ASUS VK246H 24" HDMI 1080p 2ms monitor - with web camera - best thing I have ever bought for PC…

The monitor supports 1080p TRUE HD…

I have an ATI Radeon 4800 HD series… which also supports 1080p - It has a HDMI port at the back…

From my PC graphics card via HDMI to my monitor HDMI… so I am on a HDMI connection… now… how do I watch true HD on my monitor? I am not talking about vimeo or youtube HD - thats not true pure HD you get on sky sports…

do I need to buy a sony bd rom or liteon?? what do i need to do?

PS- did not know where to post this.