Faulty sensor in canon dslr?

I have a Canon Eos 350D and it is taking compleatly black or very underexposed pictures, is this a faulty CMOS Sensor? I had this problem when I first bought the camera and the sensor was replaced. The camera is now about 6 years old and it seems like the same problem I had before. This has been an intermittant... show more I have a Canon Eos 350D and it is taking compleatly black or very underexposed pictures, is this a faulty CMOS Sensor? I had this problem when I first bought the camera and the sensor was replaced. The camera is now about 6 years old and it seems like the same problem I had before. This has been an intermittant problem for sometime, the camera will take a few pictures fine but then very dark or black ones again.
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