I recently had to reinstall SL and it was working fine for a couple weeks, i never updated to 10.6.3 and used NBI 0.8.3 final, last night i was watching some vids on youtube and they were playing fine then after a while got choppy, then the whole os was really sluggish, i rebooted and it was still running really slow. I ran NBI again and once it was done i rebooted and now i get that stop sign looking symbol. I booted into safemode and ran NBI and i was able to boot into SL, my audio wasn't working so i once again ran NBI and now im stuck with the sign. If i boot into safemode and run NBI im able to boot into the OS again but either it runs very slow or the audio doesn't work. I really don't want to reinstall SL as this would be the 5th time i would have had to. Any help. Thanks guys.