Most pobably you are just burning (copying
) the iso file to the DVD. You need to select the 'Burn Image to Disc' option in whatever burning software you are using. Then select the iso file you've got and you should get a bootable DVD after the process completes.
After this you need to check the MD5SUM of the burned disc. Only if this turns out to be ok can you succesfully install fedora.
The installation stops at media test.
Do you mean that your comp boots from the Fedora disk and then stops at the media check? This happens when the checksum (MD5SUM normally) is wrong. If this is the case, you need to reburn the iso to a new disc.