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My Samsung Blu-ray surround sound system malfunctioned for the second time, with the error message showing "Fan NG". After showing this message, the entire system would shut off completely. This seems to be a common issue. This is not a software issue, but a hardware issue. I took out the first fan, and it was no longer working. I was able to purchase a new fan and install it, which resolved all of the problems. This is how you do it.