When a monitor identifies a connected cable but not a device or video card on the other end of that cable, messages like “Check signal cable” appear. This frequently happens when a computer is turned off or when a video card isn’t installed properly.
Make sure the computer is turned on before disconnecting and reconnecting the cable to fix the problem. If the message remains, turn off the computer and double-check that the video card is properly placed. Make sure the right source is selected in the configuration menu if the display permits input from multiple sources.
Read more: What Is the Weight of a Bell Pepper?