MAC OS X Snowleopard does not boot up

I am running MAC OSX 10.5.8.  I bought Snow Leopard DVD from Apple Store and inserted it into DVD drive.  It is not recognized by the macbook and does not boot up.  The drive is operational as I inserted another DVD into it and it was recognized by the computer.  Please help!

Perhaps you received a defective DVD. Try it in another Mac. If that works then you can clone the DVD to an 8 GB flash drive and boot from it. The flash drive must be partitioned and formatted for use with OS X.

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