Consider following the documentation link near the top of this page and reading the section of the wiki on "cheat codes" (or read the document that comes with a torrent download). I'm guessing that the nopcmcia code may help, but that's only a guess. And I'm hoping (but not really expecting) that you checked the md5 sum of the ISO before burning and burnt the ISO at slow speed, skipping either of these can lead to boot problems. See the downloading faq for details.