I bought the components for a computer two years ago, intending to assemble them myself. The company I bought them from fortunately assembled them for me and I've been very happy with the performance since. Starting about six months ago I noticed a whining noise when I turn the computer on in the morning. After about two minutes the sound fades away, and it doesn't recur until I've turned the computer off for an hour or two (which I almost never do). When I opened up the case I could identify the source a the cooling fan on the cpu. I found several videos on Youtube showing how to lubricate computer fans, but when I peel back the warranty sticker on the fan there is no oil reservoir there, only a metal central shaft with the plastic fan tightly bound to it. Since I've lifted the sticker up I suppose I've voided the warranty, but I'd like to know if there's any way to lubricate the fan myself or must I buy a new one?