2009 MACBOOK FLASHING "?"
i CANT USE MY MACBOOK ITS FLASHING "?"
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That's because it cannot find a valid OS to boot from.
Do you know which version of macos runs on the MacBook? If you're still running Leopard (10.5.x) or Snow Leopard (10.6.x) your Mac has no recovery partition to help troubleshooting.
Do you have a good backup? If you don't have a very recent backup (yesterday) and are not familiar with troubleshooting procedures, I suggest you leave it to a pro.
https://support.apple.com/en-us/HT204323