Some customers using a DOS Compatibility Card in their Macintosh computers found that when they attempt to switch from the Mac OS to the DOS card by pressing the Command/Return key combination, the screen dims, but they do not get a DOS prompt.

The most common cause of this situation is the video cable. If the DOS Compatibility Card video cable is not securely fastened to the monitor cable and DOS Compatibility Card, or you do not have the DOS Compatibility Card video cable connected properly, the screen dims, but you will not see the MS-DOS prompt.

Check the cable connections and restart your computer. If you do not restart your computer, the monitor will not sync properly because when the PC Setup control panel loads it determines what type of monitor is connected. When it cannot determine what type of monitor is connected, the PC Setup control panel defaults to an Apple 16-in. Display setting.

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