How to do a basic troubleshooting for a CCTV system?

1. Check power supply: Make sure the camera is getting power. Check that the power outlet is working and the camera is plugged in properly.

2. Check cable connections: Verify that the cables connecting the camera and the recorder are properly connected and not damaged. Make sure that the camera's power cable and video cable are both securely connected to the camera.

3. Check camera settings: Ensure that the camera settings are configured correctly. Check that the camera is set to the correct resolution and frame rate, and that it is not in night mode during the day.

4. Check recorder settings: Verify that the recorder settings are configured correctly. Check that the camera is assigned to the correct channel on the recorder, and that the recording settings are set up properly.

5. Check hard drive: Make sure the recorder's hard drive is working properly. Check that there is enough storage space available for recording, and that the hard drive is not full.

6. Reboot the system: Try rebooting the camera, recorder, or the entire system. This can often resolve simple issues.

If none of these basic troubleshooting steps resolves the issue, it may be necessary to consult a professional CCTV technician for further assistance.