My Playstation 2 Doesn't Read Non-scratched Disks. Please Help,10 Points?

All right. So I just went to Family video to repair a couple of games for my PS2, And the disks still don't seem to read I don't get it! The disks have no scratches or dust or anything on them and the PS2 still doesn't read the disks. Is there something wrong with my system?

Suggestion:

U cod have some dirt problem with the lens tr ye to clean it with clean water with a little soap in on a cotton tip pt pin and dry it with a dry clean one and test again! If ur system is very old and used u cod test if the slide is worn. u just put in the disk and then flip it over 180 upside down and tr ye to play it if that works ur slide is very worn( that is possible to fix to!