Solving Problems; Built-In Diagnostics - Dell ST2420L User Manual

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Solving Problems

Dell™ ST2420L/ST2421L monitor User's Guide
Self-Test

Built-in Diagnostics

Common Problems
Product-Specific Problems
Troubleshooting the Dell™ Soundbar (Optional)
CAUTION: Before you begin any of the procedures in this section, follow the
Self-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 back of the computer. To ensure proper Self-Test operation, remove the Analog (blue connector) cable from the back of computer.
3. Turn on the monitor.
The floating dialog box should appear on-screen (against a black background) if the monitor cannot sense a video signal and is working correctly. While in self-test mode,
the power LED remains white. Also, the dialog shown below will continuously scroll through the screen.
4. This box also appears during normal system operation, if the video cable becomes disconnected or damaged. The monitor will enter Power Save Mode after 15 minutes if
left at this state.
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 have performed Step 5, check your video controller and computer system.
Built-in Diagnostics
Safety Instructions.
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