I am thinking to connect my photo camera to my laptop for live view to use it as a HD PC camera. The PC (Dell Inspiron 3010) had a HDMI port, but I could not figure if it in/out. The graphics card is Radeon HD 5470.
As far as I know, PC video cards *never* have video input via the HDMI port. You'll find a good explanation (albeit about video recorders rather than PCs) at http://news.cnet.com/8301-17938_105-9870317-1.html
Look at the video card, if it has an HDMI port it supports it.
What an HDMI port looks like: [Broken Link Removed]