Is it harmful for the Ps4 or monitor if I pull the HDMI cable while the two are on (monitor I know whether it was on)?

I accidentally pulled the HDMI cable out of my monitor because my monitor constantly shows no input signal, so I thought the problem would be when connecting to the monitor and then pulled out the HDMI cable and the Ps4 was on IS IT DAMAGED? But then I noticed that HDMI cable was not properly connected to the Ps4, so I ran it.

No.

No.

No, the HDMI cable only transmits images and audio.

Complications could arise if you unplugged the power cord

OK thank you