Network recovery depends on your network status and time, need 8-48 hours, with macosx CD or u disk installation or faster drip!!
1. Press the option key at boot time to make a network link.
2. Then press command+ R key. Mac automatic networking recovers and goes to MacOS x utility.
3. Go to "Disk Utility".
4. Select a disk on the left, choose the Partition tab, and select partition layout (1 partitions).
5. Change the "name" and change the format to "MacOS Extensions (journaled)".
6. Click "Options ..." and select "GUID Partition Table".
7. Click "Apply" and click "Partition" in the pop-up window.
8. Exit the disk utility, go back to MacOS X utility, and select "Reinstall MacOS X".
9. Click "Continue" to prompt "to download and restore MacOS X,apple will verify that your computer is qualified for this", the white Apple rest assured that continue!
10. Click "Agree".
11. Select the disk and click "Install".
12. The computer starts to download MacOS X installer, will be nearly 4G