We just purchased Guitar Hero and when we put it in our PS2 it dont spin the disk??

Here's what I did to fix the same problem on my PS2 (Slim model # SCPH-70012). This should work for all models of PS2's. (Slim or Fat). Sony says all models can read a dual layer disc. If the fix doens't work then you need to send in your PS2 for service.

1) Start up the PS2 with no disc in it.
2) Highlight the 'Browser' menu and press the 'green triangle' button.
3) Highlight the 'Console' menu and press the 'green triangle' button.
4) Highlight the Diagnostics menu and press the 'blue X' button and select 'ON'.
5) Press the 'red O' button to back out of this menu.
6) Highlight the 'PlaystationDrive' menu and press the 'green triangle' button.
7) Highlight the 'Disc Speed' menu and press the 'blue X' button and select 'FAST'.
8) Press the 'red O' button to back out of this menu.
9) Turn off your PS2.

10) This step is optional.......I blew into the main unit to loosen any dust out of it and then carefully used my shirt to wipe across the lens at the back of the drive. I'm not sure if this mattered or not. Since I did this in conjuction with the above steps I can't say if this is needed.
11) Insert the disc and turn the PS2 back on. The diagnostics should run and automatically adjust your PS2 to play the game. I was amazed! Mine loaded right up after several previous days of nothing.

12) I checked the settings after the initial load and the Diagnostics and Drive speed reset to normal so it must be a one time run thing. My game has loaded everytime since and I haven't had to re-do the settings at all.

I hope this works for you too!!