2009 mac book needs reset
this macbook doesn't work well. i need to reset it
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Depending on what's the cause of symptoms you see, there may be relief
by using some of the means this article provides; none of these seem easy.
• About macOS Recovery on Intel-based Mac computers - Apple Support
https://support.apple.com/en-us/HT201314
This explains some of the ways what is offered may be helpful.
Each issue has causes; to troubleshoot them involves trying to
resolve them through discovery & thus attempt to solve them.
The following article has similar yet different means toward an
end; hopefully a successful outcome by another route. See the
portion near bottom of this page, which shows 'other' options.
• How to reinstall macOS - Apple Support
https://support.apple.com/en-us/HT204904