Face Time camera not working

When I attempt to use Face time, the program opens but without the expected image of myself through the camera. The same happens when using photo booth.

When I look in system report under "camera" it reports the make and serial number of the camera installed.

When I look under the "USB" the camera is not mentioned. I also noticed that under the USB heading sometimes it shows a card reader present and sometimes it is not shown.

I have tried to issue command "sudo killall VDCAssistant" in the terminal but that reports "no matching processes found"

Can anyone help please

Regards

Phil Holland