I occasionally hear clicking noises in my pc. They are by no means loud and not really that frequent, I hear like 2-3 clicks after many hours of use. I have done a SMART test to test my hdd but apparently it is still pretty healthy. I did have a problem with my psu short circuiting (I dont know what caused it but that psu used to click far more regularly). The previous psu was a corsair 550w 80+ gold certified semi modular psu. The new psu I have is the fractal design ion+ 760w fully modular psu.