How do I delete a partition on a hard drive?

I have a 2012 MacBook Pro with OS X Lion (don't know the version), I installed windows 7 shortly afterwards and primarily used that. I've now sold the laptop but need to delete the windows partition and that's where the problem started. The original Mac partition stopped working, so I deleted the content on the bootcamp partition and reinstalled OSX onto that one, now I am unable to delete the original partition so only half of the 500GB hard drive is available to use. Can anyone tell me how to delete the old partition so I can then just re-install OSX so it's ready for its new owner? I also have two recovery HD partitions. Please help!

make it easy, kill 2 birds with 1 stone
reboot holding 3 keys - option, command, r - you should see a spinning globe, if not try again
open disk utilty, select your HD on the left and erase/reformat as mac journaled
exit du, choose install OSX
result - no more windows or other random partitions and a fresh OSX like out of the box

Similar Messages

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    Please click the white KUDOS star to show your appreciation
    Frank
    {------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
    Please click the "Accept As Solution" on my post, if my assistance has solved your issue. ------------V
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    (56735)

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    Message was edited by: Ingo2711

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