There should be a DVD button on your stereo. Mine also came with two pairs of wireless headphones so folks could watch a DVD without the driver having to listen to the sound.
The player is probably broken.
If the DVD player in your vehicle is not powering on the wiring may have come loose. Take your trailblazer to a repair man that can fix DVD players and other electronics.
The Last Drop - 2006 was released on: Germany: 13 April 2006 (DVD premiere) USA: 18 April 2006 (DVD premiere) Netherlands: 23 May 2006 (DVD premiere) Spain: 31 May 2006 (DVD premiere) Sweden: 2 August 2006 (DVD premiere) Finland: 6 September 2006 (DVD premiere) Poland: 14 November 2006 (DVD premiere) Greece: 20 November 2006 (DVD premiere) France: 1 October 2008 (DVD premiere) Italy: 17 June 2009 (DVD premiere)
Assuming the aftermarket DVD player is for automobile: If the DVD manufacturer states that it could be used for the Trailblazer, it is likely that it will work. You might have to modify the bracket holder, the fascia and some other trim pieces. If you try to use a DVD player that does not design for the vehicle, the electrical connector and wiring will be incomparable with the ones in the vehicle and it won't work.
Room 6 - 2006 was released on: Australia: 2006 (DVD premiere) USA: 13 June 2006 (DVD premiere) Germany: 24 November 2006 (DVD premiere)
A DVD player does not have surround sound built into it. You can purchase surround sound speakers and connect them to the DVD player. This will make your movie experience much better.
Warriors of Terra - 2006 was released on: Canada: 2006 Spain: 18 October 2006 (DVD premiere) USA: 31 October 2006 (DVD premiere) Greece: 30 January 2007 (DVD premiere) Japan: 2 February 2008 (DVD premiere)
It is out on DVD since 2006
HD DVD was created in 2006.
The best brands of DVD players to use for a DVD player surround sound system will be brands listed as a home theater DVD player. The home theater DVD player is specifically designed to make the most of the surround sound system.
Hoot - 2006 was released on: USA: 5 May 2006 Brazil: 28 July 2006 Mexico: 11 August 2006 Australia: 7 September 2006 Argentina: 11 October 2006 (video premiere) Iceland: 12 October 2006 (DVD premiere) Germany: 3 November 2006 (DVD premiere) Greece: 8 December 2006 (DVD premiere) Thailand: 14 December 2006 Ukraine: 21 December 2006 (DVD premiere) Sweden: 17 January 2007 (DVD premiere) Hungary: 1 February 2008 (TV premiere) Netherlands: 18 March 2008 (DVD premiere) Italy: 21 January 2009 (DVD premiere)
Cloud 9 - 2006 was released on: USA: 3 January 2006 (DVD premiere) Netherlands: 2 May 2006 (DVD premiere) Hungary: 13 February 2007 (DVD premiere) Japan: 11 April 2008 (DVD premiere)