Re: fixing heatsink fan?
WD-40 is NOT a lubricant, it's penetrating oil. You use it to free up rusted bolts, or anything rusted or stuck.
You can use a bit of sewing machine oil like mr mixx said or something like 3 in 1 oil, both of which you can buy in most any store. I've done this before on an old pc that had a noisy intake fan. But...be advised, now that the pc has sat for a while, the fan does not work anymore, not sure why, but just be aware of that.
When all else fails...Ham Radio!
I still have the same old HP DV9700T laptop I've had for years...still kickin'