See Apple's OS X: Updating OS X and Mac App Store app page for Software Update instructions.During technical troubleshooting, you may be required to reinstall an OS update or driver.
In Device Manager, expand category Display adapters.
Note if you failed to install the driver in this way, install it manually step by step through Device Manager.
Driver Easy has Free version and Professional version. Then Driver Easy will scan your computer within 20 seconds and find new drivers for your immediately. With Driver Easy Professional version, you will enjoy Free technical support guarantee.
With Professional version, to update all drivers, just 2 clicks are needed. You can ask for assistance regarding any driver issue you may encounter.
Updates to your computer’s motherboard, sound card, and network drivers don’t generally give speed improvements.