PC making rattling noise

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Deleted member 2621623

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I just built my very first PC yesterday and everything were flowers until I started hearing a somewhat metallic/rattling noise coming from it when the processor needs to work harder. It's very similar to this one https://youtu.be/1ukeJ0u3srI?t=1m52s except that it's way quieter on mine.
I suppose it's coming from the water cooler radiator fan since it's connected onto the cpu fan on the motherboard. But I really don't know how to fix it.
If anybody had this problem before please help me.
Cooler model: CoolerMaster ML120L RGB.
 
Solution
Could be a loose screw or something. Perhaps even the case.

The top of my case sometimes makes a rattling noise. If I press my hand on it, it stops.