I've recently formatted my 10.7.4 mountain lion MacBook from 2007. The hard drive is wiped and I think it deleted to OS too. How do I put the OS back on it?

I've recently formatted my 10.7.4 mountain lion MacBook from 2007. The hard drive is wiped and I think it deleted to OS too. How do I put the OS back on it?

Wiping the drive does indeed delete the OS. Try this -
Boot to the Lion (10.7.4 is Lion not Mountain Lion) recovery partition by restarting the computer and holding down the command and R keys during startup.
If this works, reinstall from here. You must be connected to the Internet to do this.
If this does not work, possibly because you reformatted the recovery partition as well, you will need to reinstall from your original disks (assuming it came with 10.6 or earlier.) Boot to the disk by holding down the C key during startup and run the installer.
Best of luck.

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