I downloaded BackTrack 4 Pre Release and burned it to a DVD.
I tried to boot on the DVD but selecting "Boot from CD" on my BIOS boot menu. It starts loading the DVD, but it takes forever. Nothing happens for hours.
I tried the DVD in another computer. I select boot on CD in the bios, presses enter, but it just ignores it and boot windows instead.

I checked the MD5-sum of the ISO I downloaded. It matches the website. I thought that something might have gone wrong when I burned the DVD, so I checked the MD5 of the files on the DVD, and matched them with the files on the ISO-image. They matched.

Am I missing something here? Why can't I boot on the DVD?