The first step is to hard reset your laptop. Use these steps to reset your laptop. Force shut down your laptop by pressing and holding the power button. Disconnect your charger from your laptop and ...
Exact steps for Intel and Apple Silicon Macs ...
[Editor’s note: This article is part of our series of articles on installing and upgrading to Lion (OS X 10.7). We also have a complete guide to installing and upgrading to Mountain Lion (OS X 10.8).] ...