Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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Why my MacBook Pro (mid 2009) run slow?

I need urgent help!, my macbook pro (mid 2009), just start to slow down, but severaly, i can`t even start an app. I even erase the HD and reinstall snow leopard, but its still the same and i try to diagnose with pressing D at power on with Installation disc but , dont enter diagnostic mode or something, i hope can someone help me :( thankyou.

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How well does it run when booted from the installation DVD? I would reformat the hard drive using the "write zeros" option, to eliminate any bad blocks, give it one partition, then install a new system.

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This failing, replace the hard drive cable.

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