My Macbook Pro will not load from Snowleopard Install disc

I have been having some issues with the speed of my mac, and yesterday decided to reset from the install disc.
Every time I try to load my mac from the disc it shows signs that it's reading the disc, but then ejects it and goes straight to the screen with the apple logo and cogwheel, where it gets stuck.
I cannot get past the cogwheel screen, i have reset PRAM and SMB, with no success.
Holding the option key does not help as it doesn't acknowledge the disc, and i have checked the disc, it is scratch free, an it d the drive is clean.
When running hardwear test it shows up 1 error with my harddrive, (the reason i was resetting from install disc in the first place.)
HELP!

The error is for a sensor, so that should not indicate a problem with the HDD. As for your installer disc the Mid-2009 MBP 13" came with Leopard, not Snow Leopard. You might check what is printed on the disc label just to be sure.
I don't know why the disc won't work. It could be an alignment problem with optical drive or something on the disc's innermost tracks. It can't hurt to get a lint-free cloth and clean the disk with alcohol.
You might try turning off the computer and wait a few minutes then restart it. Put the disc in before you shut it down. Then when you restart the computer press and hold down the "C" key immediately after the chime.

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