Reformat and reinstall osx lion from internet

Question

Not sure how this works.  i have purchased a used macbook pro 13" i7 8gb ram 750 hd.  The last guy reformatted the drive in a way that will not let mavericks install.  It stated the drive needs to be guid.  i have tried many times to attempt this and I still get same message and the disk utility will not let me change anythign about the drive. 
I have installed the firmware update that will allow the coputer to get the osX from a broadband connection.
I am wondering if this will refomat the drive so i can put Mavericks onthe computer?  If so what are the exact steps to accomplish this?

Answer 1

That's OK. You need to repartition the drive anyway because you cannot install anything on it until you remove what had been installed including the Recovery HD partition.
Install Mavericks, Lion/Mountain Lion Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your external hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
This should install the version of OS X that was pre-installed from the factory.