Clicking/banging noise - IBM thinkcentre

Hello to all
I am not technicaly of a high standard, so any advice given would be appreciated if it was quite simple please.
I have an old IBM thinkcentre and it has made a regular loud clicking/banging sound for a few months now, any help would be appreciatted. thank you in advance.

Alan
 
Open the case and see if you can determine where the noise is coming from exactly. What ever is making the noise will have to be replaced...
 
Ok, thanks! I am not 100% sure where it's coming from to be honest, but when my pc is slow the noise gets quicker?
 
Probably a bad fan. If it is the CPU cooling fan you may want a computer service center to fix it for you
 
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