Why I can't install SL from orginal DVD to macbook pro

Feb 18, 2011
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I have a MBP. And 10.6.3 SL DVD. I wanted reinstall. I put this dvd to my mac and I delete all HDD. After this, I started install. But dvd didn't read and couldn't install.

Anyway I buy new DVD from internet today. 10.6.3. But this dvd not boot. I put dvd to mac and I wait but nothing. Just apple logo. I look with CMD S:

Loading System/Library/Caches/com.apple.kext.caches/Startup/Extensions.mkext

Sorry for bad english.

I think I need clean cache but I don't know how I can do this.

Please help.


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