You may feel these symptoms first in your feet and then possibly in your shins: 1  Numbness, tingling and pain. 2  Unsteady when standing, walking. 3  Muscle weakness (including weak ankles) or cramps.
720HD is 1280 x 720 pixels per frame. The highest resolution that the DVD format can support is 720 x 480 pixels per frame for NTSC (or 720 x 576 pixels per frame for PAL), which is at best only 37.5% of the resolution of 720HD.
In fact, you can greatly improve the playback quality of your current DVDs when using a Blu-ray player. A standard DVD player plays your DVDs at a video resolution of 480i. That produces a good quality picture, but it won't take advantage of your HDTV's higher resolution. A Blu-ray player can upconvert your DVDs to 720p, 1080i or 1080p, depending on your HDTV and the connections you are using. While this will not provide the same high-definition quality of a Blu-ray movie, it should definitely improve the look of your DVDs when compared with a standard DVD player output.