How to fix PS2?

Ive been having a problem with my PS2 it wont read the disc. i put a disc in and it gives me this ticking sound.

i opened the ps2 up and got the the dvd rom and started playing around with the white gear that adjust the lens

i adjusted by turning the gear 2 clicks at a time went all the way around and still couldnt get it to work

should i try every gear teeth? are there any possible ways to fix this thing?

they say you should turn the gear clockwise, but i had better luck going counter-clockwise by 2 clicks.

You should also vacuum PS2 real good. See if the rails that the laser is moving on are greased up. Lithium grease will do the trick, available at home depot or lowe's.

good luck