Quote Originally Posted by valexvo
Can be that because I boot from a DVD drive?
I boot from a DVD drive most of the time (DVD is the only optical drive on my notebook and the primary optical drive on my main desktop), and have no such problems.

I suspect you may need one or more "cheat codes" to resolve your booting isues. You say you did do the md5 check; great. I hope that implies that you have read the downloading faq and have also done your burn at a slow speed. If so you may also wish to try the testcd cheat code, just to be safe.