Hello,
every PC has a DSDT, you may need to patch it in order to run OS X or not, there's no relation with having UEFI BIOS.
Just move the video kexts out of the Extensions folder to be able to boot the system and make the needed configurations, then you can re-install the kexts.
Details here
http://Olarila.com/forum/viewtopic.php?f=28&t=2193