Dell P2423 Monitor Users Guide - Page 65
Troubleshooting, Self-test
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Troubleshooting WARNING: Before you begin any of the procedures in this section, follow the Safety instructions. Sel f-test Your monitor provides a self-test feature that allows you to check whether your monitor is functioning properly. If your monitor and computer are properly connected but the monitor screen remains dark, run the monitor self-test by performing the following steps: 1. Turn off both your computer and the monitor. 2. Unplug the video cable from the computer. 3. Turn on the monitor. If the monitor cannot sense a video signal and is working correctly, the following message will appear: NOTE: The message may be slightly different according to the connected input signal. NOTE: While in self-test mode, the power LED remains white. 4. This box also appears during normal system operation, if the video cable becomes disconnected or damaged. 5. Turn Off your monitor and reconnect the video cable; then turn On both your computer and the monitor. If your monitor screen remains blank after you use the previous procedure, check your video controller and computer, because your monitor is functioning properly. Troubleshooting │ 65