My disks won't spin or read on my ps2 slimline

check the following image with red marking area and if problem is not solved you better change the lens with a new one.

yes when you open your ps you can remove the lense by using small screw driver.
if you remove it you can blow very well by using air compresser

1. Check to see if a Music cd will spin in the console
2. Open flip lid and examine the reset switch - check to ensure the switch is intact - you are looking for a small lever which is made of lack plastic. If its not there you need a new reset switch
   
3. If the laser is not moving at all you will need to open up the console (WILL OBVIOUSLY VOID YOU WARRANTY!)
4. Check the PCB switch at the rear of the console. This part connects to the lid of the ps2 if thats is broken you will need to replace - difficult to source but they are available
5. Check the ribbon cable underneath the PS2 Laser for any signs of damages
6. Check the ribbon cables x 2 which attach the laser assembly to the motherboard
7. Remove the motherboard metal shield and test the SMD (SURFACE MOUNTED) on the underside of the board use a multimeter for this
8. If your console passes all these tests the most likely cause is a blown laser which is a simple part to source via ebay etc.
9. If your new laser does not fix your problem then you have a blown RS2004 chip which is expensive to replace and usually not economical to do.