Try pressing esc after it starts to load, just before or as the
first graphical screen appears. This should give you text view of the load
process and you can see better where it is stalling. It could be a bad
disk, a bad burn or a problem with your computer and KDE in which case you
may have to try some boot parameters to shut off some of the functions. I
don't know without more information what is wrong, though. Try again and
post what you see. Also tell us more about your computer.