Wierd u should say that. I had exactly the same thing from my Version 9. The buzzing sound is the laser which when u flash up moves to the centre of the dvd drive, hits a microswitch and moves back to start read position. What mine was doing was ignoring the microswitch and carrying on trying to move to the centre of the dvd drive. The sound is the plastic teeth grinding over the wormdrive at the side of the laser.
Unfortunately I have no cure for this. I took the lid off of the ps2 and the dvd drive and watched what was happening, found that after 3 seconds of buzzing it start to load something up so put up with it for a few days. Now for some unexplainable reason it's not doing it any more.
Sped metal suggested it could be a damaged Reset/eject bable so if you've had yrs apart recently it could be worth stripping and checking out. Apart from that I can't be any help.
Regards
