I just bought a new HT-Q20 Home Cinema System and had it professionally installed. It worked while the technician was here, but after using it for a few minutes, a small pop went off on the left front speaker, the machine showed the word "Protection", then shut down. Now every time I try to restart it, it does the same thing as soon as any sound comes out of it. Troubleshoot says this might be because the fan is not working, but I already checked that it is. Does anybody know how I can get rid of this problem or is it a faulty machine?