Same thing happens on my system also. I've tried all kinds of flags and it just seem to not work.
10.5.1 install starts up fine. this one wont get past the first 5 secs of booting.

i did a -v flag and as i dont remember exactly what it says, i know it doesnt say anything failed loading correctly or anything.

scratch that last post. i reburned it at 1x write speed and it gets pasted that screen, now im just having other issues i'll see if i can work with.
FYI, initially i burned it at 16x, knowing that it could possibly cause issues, my bad.

same thing, burned my 10.5.1 again at 1x - installation succeeded!
now struggling with booting from hdd, but this issue is too popular to mention =)