My DVR Monitor Has No Display or Isn't Recording – Rear View Safety

If your MobileMule DVR monitor is showing a black screen, no image, or your DVR doesn't seem to be recording, here are the most common fixes.

Check that your monitor's video cable is firmly connected to the correct port on the DVR. Depending on your monitor, this will be a yellow (composite/RCA) or VGA port.
Make sure your monitor is powered on and set to the right input. Try pressing the Input or Source button on the monitor to cycle through inputs.
Try swapping the video cable with a different one to rule out a faulty cable.

Try connecting a different camera to the same port, or move the camera to a different port on the DVR. This will tell you whether the issue is with the camera, the cable, or the port.
If your camera has a higher resolution than your DVR supports, it will show a black screen. Older DVRs support up to 480P (960H) or 720P. If you recently replaced a camera, the new one may be a higher resolution than your system supports.
- To fix this, change the channel mode in your DVR settings to match your camera's resolution. Refer to page 24 of your unit's manual for instructions.
Make sure the channel is enabled in your DVR's camera settings menu.

Check that your SD card is fully inserted into the SD card slot.
Log in to your DVR (default username: ADMIN/password: 888888) and go to Tools > Format to format the SD card.
- Formatting will erase any existing footage and may cause the DVR to reboot — this is normal.
After formatting, go to your Record Settings and confirm that recording is set to Continuous.

If you've tried the steps above and your DVR is still not displaying or recording, contact our support team, and we'll help you sort it out.

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