I was finally able to get an HDMI. Originally I was using component video.
Example game to be used: Dead Space.
When using component video cables, the output would go to 1080i, the maximum my TV would accept. Playing Dead Space on that resolution was awesome.
I then started using my HDMI Ver 1.3 cable. Now, it only outputs to 720p, even though component cables would reach 1080i. I can easily tell the difference on 720p, as the graphics aren't as crisp and detailed as on 1080i.
Why is this happening? How can I fix this? I want the game to go to 1080i, as before.