Check cable on a monitor is generic error for when the monitor isn't receiving a video signal. Normally it isn't a faulty cable when it happens in use. It could be a lot of things which some more detail could help to isolate.
What monitor is it and what cable are you using to connect to the computer.
Is the computer a desktop or laptop.
If a desktop is it using the on board graphics or a separate card.
What do you need to do to get the monitor working again.
A quick way to give all this detail is to run a Speccy report and publish a link to the report , with a link to the report here.