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I would be glad to help. Based on the information you provided, it sounds like you switched the input the monitor is displaying which would explain the problem. It's possible that the issue is something else, but I would need more information to be sure. If you are able to provide the Brand and Model of the monitor I can provide instructions on how to change the input for you.
Also, most monitors will be able to detect when a valid input source is connected, and switch to it automatically, so you may want to try unplugging the power cord from the monitor, then make sure your video signal is being sent to the monitor, and plug the power back in and turn on the monitor. It should detect the input and switch to it automatically.
If your monitor is displaying any messages please let me know and I can diagnose the problem further.
If my previous suggestion did not work, please let me know the Brand and Model of your display, and I can look into specific instructions for your device. You can post your response on our website here:
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