The HD DVD format has been discontinued since 2008 but it is still possible to play high-definition (HD) DVDs using the Blu-ray disk (BD) format. It is not necessary to be technically savvy to play HD DVDs using Blu-Ray because Blu-Ray works a lot like standard DVD players except that it also plays HD DVDs. You do however have to have a technologically advanced hardware such as an HDTV, a Blu-ray disc player and High-Definition Multimedia Interface (HDMI) cables.
Plug a Blu-ray disc player to your HDTV using an HDMI cable. Note that the HDMI cable is capable of transmitting both high-definition video and high-resolution audio so you don't need more than just an HDMI cable. HDMI cables are available online and at any electronics store.
Insert a Blu-ray disc into the Blu-ray disc player. Note that only a Blu-ray disc is capable of playing this type of HD DVD though these special players can also play standard DVDs and even music CDs. Also note that Blu-ray disc players come in the form of computer disc drives, video game systems, such as the PlayStation 3, and individual disc players.
Power on your HDTV if it isn't already on and press "Play" on the Blu-ray disc player. Note that your TV has to be on the HDMI input mode though most modern television sets will change automatically when you press "Play" on the player.