Was working now not working?

I have an advent 4213 notebook. I use it a lot to talk on Skype and use the webcam a lot. The webcam has stopped working, the blue light is no longer staying on but flickers when the computer is starting up. I have cleared all programs but it still does not work.
The computer says it is not detecting a camera and we should plug it in or if it is integrated we should turn it on. My webcam is integrated but I have been unable to fix the problem. Help please!!