Yeah I meant CCFL. I don't recommend servicing it yourself if you don't know what your doing. If you must, there are guides out there that'll help you.
Yes, I do have an idea. I had the same problem on my samsung 20.1'. It means your CFL inside the monitor is dying. It'll eventually die and you either have 2 options: (1) repair it and (2) use your warrenty.