PS3 Disc Read Errors
If you load a disc into your PS3 and the console fails to recognize the disc, you have what is known as a PS3 Disc Read Error. These errors are some of the most common errors encountered by PS3 players, and they are often easily fixed at home.
One of the first steps you need to take when troubleshooting your PS3 disc read error is determining whether the error is a problem with the disc or with the console itself. If your PS3 is able to read some of your discs but not all of them, it is likely a problem with the discs themselves. Carefully check over the problematic discs, looking for scratches, fingerprints or other signs of problems. Often these errors can be cleared up by simply cleaning your PS3 discs carefully.
However, if your PS3 is unable to read any of your discs, the problem is most likely an issue with the console itself. Often this problem is caused by excessive dust buildup in the unit and on the blu-ray lens. Your first step for repairing this problem should be cleaning the unit carefully. This can be done in part by spraying condensed air into the vents of the unit so that dust particles are expelled. Next, you should get a blu-ray lens cleaner to clean the lens itself.
It is likely that cleaning your unit will clear up your disc read error problems, but if this is not the case then you will need to move onto slightly more complicated fixes. It may be that your blu-ray lens is misaligned. Realigning the lens can be done at home, but you should get a copy of a PS3 repair guide such as PS3 Repaired to help walk you through all the steps of this process.