SILENTIUMPC Fortis 3 HE1425 - weird noises.

I can't hear anything on that video apart from normal fan noise.

Can you describe the noise you're hearing? Is it a rattle, or a squeak, or anything that would indicate the bearings are going bad? If so, replace the fan.
 
Perfectly normal, your CPU fan is PWM controlled and at some duty cycles the motor is cycling on and off rapidly, hence the ticking. Nothing to worry about.
 
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