I am selling my Macbook and am trying to erase and do a clean install of 10.6. I keep getting an error that says I can't install OSX on this computer and can only restore from a back up. I've tried repartitioning the disk and made sure it was GUID.

After restoring the disk from a back up, I'm still getting the same error. Why won't it let me erase and re-install??

Are you using the original gray-faced OS X DVDs that came with the system (if so, what OS X level does it say on the disk) or a retail copy of OS X 10.6 or another gray-faced OS X disk from another system? You can't use a gray-faced OS X disk from, for example, an iMac or MacBook Pro, to install on your MacBook. 
Was it originally delivered with an OS X level that is greater than what you're trying to install? You can't install an earlier level than what came with the system.
Did you boot to the DVD, and use Disk Utility to create one disk partition, then reboot and try to install? 

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