When your computer is almost started, the display switches to black and white?
If you have Adobe Gamma software installed, it may be conflicting with your video adapter driver.
NOTE: The Adobe Gamma software is delivered with PhotoShop and other Adobe products. Look for an update at http://www.adobe.com.
To workaround this issue, remove the shortcut to the Adobe Gamma Loader from your Startup folder.
NOTE: The Adobe Gamma Loader files are located at "%CommonProgramFiles%\Adobe\Calibration".