problem is typically one or two things. Many times there are
bad electrical connections causing this problem. Expect to
pay minor to intermediate labor for this type of problem.
The CCD imager can be defective. Labor is typically intermediate,
and the CCD imager's cost is model dependant.
The lens can also be at fault. Try this: When looking down the lens, turn the power on and see if you can see the iris open. You may have to try a few times. It's OK to use a flashlight. The iris will protect the CCD imager. You can also zoom in or out for a better view. If the iris doesn't move, the lens has a problem. Lenses can be repaired - other times they have to be replaced. If the iris is moving, then it's a 90% chance the problem is the CCD. Cost, as above.