HT201262 how to reinstall main frame on macbook?

my macbook is behaving strange, I want to erase all HD and re-instal the new OS X Mavericks

Erasing is rarely necessary. It will make it obvious if you have hardware issues.    Backing up at least to two different locations is essential before you attempt an erase.   And frequently before attempting any analysis anyway as hardware issues with the hard drive can start as bad behavior and just get worse.  So without knowing what's wrong, you might just be putting your head in the sand, and hoping for the best.  So make sure you have at least two separate backups.

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    filmpower wrote:
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    If you have a software problem, read this.
    ..Step by Step to fix your Mac
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    https://support.apple.com/en-us/HT3910
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