Apple Restore System and HD Recovery
From OS X Lion to present OS X includes a new feature that lets you restore system software to your Mac with just a few clicks, without having to bother with install discs or drives.
The new Mac safety net. Built right into OS X, Apple Recovery lets you repair disks or reinstall OS X without the need for a physical install disc. Since Apple Recovery is built into your Mac, it’s always there when you need it. Even if you don’t need it, it’s good to know it’s there. And you don’t have to search through original packaging to find install DVDs to get your Mac back up and running.
Command-R to the rescue. Just hold down Command-R during startup and Apple Recovery springs into action. It lets you choose from common utilities: You can run Disk Utility to check or repair your hard drive, erase your hard drive and reinstall a fresh copy of Lion, or restore your Mac from a Time Machine backup. You can even use Safari to get help from Apple Support online. And if Apple Recovery encounters problems, it will automatically connect to Apple over the Internet.
Time Machine has your back. And your Mac. Set up Time Machine, and backing up your Mac happens constantly and automatically. So when you need to restore your hard drive with Apple Recovery, Time Machine practically brings it back to life, just as it was last. And data disasters just don’t happen.
Internet Recovery. Help is everywhere. If your Mac problem is a little less common — your hard drive has failed or you’ve installed a hard drive without OS X, for example — Internet Recovery takes over automatically. It downloads and starts Lion Recovery directly from Apple servers over a broadband Internet connection. And your Mac has access to the same Lion Recovery features online. Internet Recovery is built into every newly-released Mac starting with the Mac mini and MacBook Air.
I want to try the second item down (Command R to Rescue)
You will be familiar with the Disk Utility. I want you to Repair Disk Permissions first and then Repair Disk. When complete, quite out of Disk Utility and go to Startup disk and restart your computer.
In the OS X system, there is an option to perform a disk repair and repair permissions at start up. In some cases this helps with issues.
About Apple Recovery
OS X includes a built in set of utilities in the Recovery HD. Restart your Mac and hold down the Command key and the R key (Command-R), and keep holding them until the Apple icon appears, indicating that your Mac is starting up. After the Recovery HD is finished starting up, you should see a desktop with a Mac OS X menu bar and a "Mac OS X Utilities" application window. Note: If you see a login window or your own desktop and icons, it is possible that you didn't hold Command-R early enough. Restart and try again.
Go to Utilities and perform disk repair and repair permisson and then exit out of this application and select your startup drive and restart you computer.