Kano turned on but no power for monitor

I have had my kano for about a year now. It worked when I first got it then I took a long break from it and now am starting to get back into it. The whole kano PC has power and the lights are on showing that it works but when I plug it in I get this message on my monitor. And I know it is the Kano that has the problem because I have tried several different monitors. Please help! 15881675494585158579990961458880|666x500

Your HDMI cord is probably broken so you should try to replace it.

My HDMI cable works fine. used it on 2 other things.

Try adding in your boot.txt (take the sd and open the file):