Monitor troubles

[Arcade-Projects]

Hello so the other day i put on my cocktail cabinet and it came on then well this happened.️
https://www.youtube.com/embed/DtH4UKX3Jaw?wmode=opaque
View: https://youtube.com/shorts/DtH4UKX3Jaw?si=xBPLqHW9OlcenSR5
. Ive checked the sync wire is still connected but i haven't a clue what else to check anyone have any pointers or suggestions

thanks

Source: https://www.arcade-projects.com/threads ... les.28985/