blane08 :
PS4 to monitor not working. "Check Signal Cable".
First up, what monitor?
Second of all, if you can, set the input to VGA.
Third, you provided barely any information. So it's question time
• Does the PS4 work with your TV?
• Does it work with any other monitors?
• Did you try plugging the HDMI cable into an HDMI port on your monitor? Or do you not have one?
• Are your PS4 was on?