As said check the laser lens for dust build up.... *use only* a dry
cotton bud.

If it's the CDs, try them on another unit to make sure. If faulty follow
these links-: 'Use toothpaste'
(http://www.wonderhowto.com/how-to-re...hpaste-218847/)
and 'this link.' (http://lifehackery.com/2008/07/14/gadgetry/)

The information is written between the top label and the 'inner surface,
the label inner is silvered and acts as a reflector for the laser beam,
a scratch label could also impair the playability.

If ever cleaning a cd or DVD *do not use a circular motion*, this will
add more scratches!

It could also be a sign that the laser block requires replacement, the
item may be cheap or may be quite expensive to obtain, depending on the
model number.

davy