OK, get a large and a small '+' head screwdriver, and a small '-' head screwdriver.
Now, look at the back of the PS2 at the bottom. If a small black sticker is present remove it. Now, flip the console upside down and get the small '-' head screwdriver. Wedge this underneath the small plastic and rubber squares. Now, lift them upwards. There are screws underneath. Get the large '+' head screwdriver and undo all the screws and take them out. (Note where the silver screw comes out of - don't forget
).
Now, flip the console back the right way up and have the front facing you. Lift the top of the case upwards from the back, and slide forwards. Now you're in!
Now, plug in the power, (careful not to touch ANY of the internals OR silver plates inside). Flick the switch at the back of the system, and hit the Eject button. The tray will side out. Now, just flick the switch at the back of the system off again, so the PS2 powers down, leaving the tray out. Now, you can remove the power cord and undo the two small screws at the front of the DVD Drive cover. Remove these, and unclip the two clips at the back of the cover for the DVD Drive (They can be stiff!)
Now, you can see the laser and everything inside. Down the back of this, you can see a silver clip and two small white cogs. Using the small '-' head screwdriver, give both wheels 2 clicks anti-clockwise.
Put the top back on the DVD Drive, plug back in the power and A/V Cords, and switch on. Test your game discs. If there is no change, take apart again, and give it another couple of clicks anti-clockwise. Repeat until the desired effect occurs. If there is no change, put the cogs back to their original positions and post back.