i have 3 ps2 super slims and 2 phat, i tryed a dvd movie in all the slims and it could not be read and when i tryed it in the phat it started, looks like my ps2 slims dont read disks dont know why
Check also a CD (better if you have a game, but also a music CD is good).
Then you should try regulating the trimmers, se here:
PS2 Potentiometer Adjustment - Disk Read Error Fix - YouTube
Also clean the lens and the 2 bottom plates as showed in this video:
PS-2 Slim model fix for discs not reading - YouTube
If you don't have a multimeter, adjust the DVD trimmer by a couple millimeters clockwise as shown in the video and try a DVD (without re-assemblng the Ps2. Just re-mount the lens with the 2 little screws, connect the power cable to the console, insert the DVD and press the 2 lid sensors with your fingers).
If it doesn't work, starting from the position the trimmer was at first (make sure to remember or mark it before to do any regulation), adjust a couple millimeters anti-clockwise.
If you try a CD and it also doesn't work, do the same with the CD trimmer.
Then, if you have a compressor, also blow on the fan (inside, from the upper part), probably a little cloud of dust will comes out.
If you remove the fan is even better, you can clean it more easilly and also blow on the intakes where the fan is placed upon.