A couple of weeks ago, I noticed that our CPU was making a weird humming noise and noticed that the fan attached to the CPU case stopped working. Now, ever since our motherboard expired last year due to dust and dirt, I've been conscious about cleaning the CPU regularly. But I haven't had a chance to clean the actual fan unit. So, I searched Google (of course!) for an easy to follow DIY video on cleaning CPU fans and I found one here and I proceeded to try it out for myself.