This TV has a VGA plug in the back and will accept a 1360x768 signal from a computer acording to the manual. The VGA plug on the set may be a female, not a male like a computer monitor. If this is the case a male to male VGA cable is required.
This looks like a nice set.
If it isn't 720p or 1080i/p it isn't HD. If it is 720p or 1080i/p it may not be HD content.