CPU/Mobo What's this very loud noise?

[premierseiji]

After turning on my computer, there's a very loud noise. I took a video of it:

My computer works just fine, and the loud noise automatically disappears after 5 minutes.

But it's really annoying because it usually reappears again at random intervals.

Is it the CPU fan, GPU fan or something else?

Should I be worried?

 

[puns]

clean your system... dust and stuff must be blocking the fans.

 

[seshu]

[google] computer+noise+find+cause !

 

[Prakash_Rock]

check if any cable is on the cpu and gpu fans and de clutter. If noisy cpu fan replace with new cooler.

 

[tumula]

It may be SMPS Fan. Check the system by changing the SMPS if you have one

 

[BluDev]

could be one of the bearings?
can you figure out which of the two fans it is GPU or CPU