How to find out whats making noise

Was it the CPU fan or the case fan? You said you stopped both and the noise stopped, but you didn't say whether you checked them individually.

If it's the case fan, you can probably replace it for a couple of quid - case fans are dirt cheap.

The CPU fan might be slightly trickier to get the exact same one, but chances are you can just put a similar sized fan on it without a problem. Worst case, get in touch with the heatsink supplier and see if you can buy one off them, or just get a new cooler.
 
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