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We bought an MBP three years ago. We never took the installation discs out of the packaging. We just did and they have purple stains around the edge and don't work.
Obviously the mac is out of warranty, but it seemed worth asking as I have never known a DVD to acquire "disc rot" before.
MacBook Pro, Mac OS X (10.6)
Commercial disks, which Apple uses, are pressed and cannot degrade like that. If this was a brand new Mac, then either someone switched out the disks, or they were stained in some other manner. If you bought it used, then it's likely you were given copies. If they are original disks, they should be gray with white silk screened lettering. Anything else is a copy.
If you want machine specific replacements, which would include the bundled iLife software and other titles that are not on the retail disks, contact Apple. They will ask for the Mac's serial number to make sure you get the correct disks.
Is it possible to get a new snow leopard installation disc if original has failed
