A few things to keep in mind.
1. Reinstalling Lion will not reinstall iLife. You will have to redownload iMovie, iPhoto, and Garage band from the App store.
Fist method: installing Lion from the net
1. Turn on your computer, holding the option key+power key.
2. Let go of the power key while maintaining hold on the option key.
3. Use your cursor to select your network under "choose your network"
4. Select recovery hd
5. Select reinstall Mac osx
6. Wait for the download and installation process. This should take about 45min to 9 hours. This time variation really depends on your network speed.
Second method: installing from an Apple Lion USB drive or a Self made InstallESD.dmg USB drive
1. Turn on your computer, holding the option key+power key.
2. Let go of the power key while maintaining hold on the option key.
3. Select the Lion recovery USB or your self made InstallESD.dmg USB disk which should appear on your right most option.
4. Select reinstall Mac osx
5 wait for about 30mins to 1 hour.
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