Howdy redrumshow,
I see you are a new user here in Apple Support Communities - welcome! I hope we find you contributing often in the future.
In order for you to reinstall Mac OS X 10.7 Lion on your MacBook you are going to have to not only erase the Macintosh HD partition on the drive, but the Recovery partition as well.
NOTE - this will only work if the computer came with Lion or earlier OS version originally. This procedure will not install Lion if your Mac Pro came with Mountain Lion or later.
If the MacBook originally came with Mac OS X 10.6 Snow Leopard it MAY be able to use Internet Recovery if this firmware update has been installed - Computers that can be upgraded to use OS X Internet Recovery.
The following process will destroy all data on the hard drive - if you don't have backups of everything important, stop, go back and make one NOW.
The first thing to do is to force the computer to boot to Internet Recovery. For obvious reasons to do this you must have an Internet connection available. I would suggest using an Ethernet connection, as it will work faster than Wi-Fi.
- Restart the computer and hold down command-option-R. (reference - Startup key combinations for Mac.) Depending on the speed of your Internet connection it may take quite some time for the boot process to complete. You will see a spinning globe and a progress bar.
- Once the startup is complete you will see the OS X Utilities window. Select Disk Utility and click Continue.
- Select, from the items on the left side, the hardware for your hard drive.
- Click the Erase tab.
- Give the partition to be created a name. Macintosh HD is fine but you can choose something else if you like.
- Click the Erase button in the lower right.
- Quit Disk Utility.
- From OS X Utilities, select Reinstall OS X.
From there you can proceed to do the reinstall. This article gives more information about installing using Recovery - OS X: About OS X Recovery.
Thanks for using Apple Support Communities.
Best to you.