With anything firmware, sometimes you can get a bad write to the chip. Just flash it again. Try safe mode, this time. In fact, try M9 first, then P9. Let the computer restart and then turn it off (safely) in-between.
I also got damaging "effects" from S9, and the drive made some weird clunky noises until I had flashed it with older firmwares several times (forgot the actual process, but finally got the drive healthy again).
That advice to use the .cvt flasher was really good advice too!
The regular flasher doesn't seem to write too well for some reason.
I am now able to attain very good results at 4x, so the drive isn't totally useless, but it certainly sustained some damage from S9.
Hey, if you get S9 completely wiped out, I sure would like to know how you did it! I am still getting peaks at the end of burns--using DVDDecryptor and Record Now and Nero. . .