Installing the latest version of the operating system will return the display to its normal brightness levels. Choose Software Update from the Apple menu to automatically check for the latest Apple software. Apple Downloads offers a standalone installer that you can use instead, if you wish.
To check the build level of your operating system:
- Choose About This Mac from the Apple () menu.
- Click the version that is listed in the About This Mac window. The build number appears.
The Mac OS X Install DVD included with the MacBook Pro (17-inch, Early 2009) should have the minimum build of 9G2141 or higher.