|You showed a video of the tower? What good is that? Open the case & let us see what's going on inside. And it appears you have the tower inside some sort of cabinet? That's not good.|
As for the noise, either the CPU cooling fan is spinning at high RPM to try to lower the CPU temp, or you got to cleaning the dust too late & the fan bearings are bad. Did you actually remove the heatsink/fan from the CPU? If you did, it's very possible you didn't reinstall it correctly.