After replacing a CPU fan that was making some weird noises I decided to pull it apart and see if I can identify exactly what was causing the grinding sound. The same noise has been occurring on several different PC's all with the same CPU fan, so I would like to be able to correctly identify what is happening here. So, my question to anyone who can answer is: What is this reddish dust buildup and is it normal to see when you pull apart a computer fan?
Thank you.
Thank you.