Wayne's computer fan

So, I've been working hard for two weeks on getting Wayne's office computer all set back up and functioning better than ever for him. I was almost done this week when it occurred to me that the computer fans were blowing really high and really loud- all the time. The more I thought about it, the more annoying it was. There was no way Wayne would like this. I started googling for information and found that there were fan problems with this model of Dell and most of them were caused by people trying to do BIOS upgrades, which I had attempted to do. I quickly fell into a swamp of depression as I mulled over hundreds of forum posts that basically say that nothing can be done but replace the motherboard. I spent three evenings this week reading forums and attempting various things to stop the fans from blowing so hard; I even pulled apart the computer and re-seated the processor. Nothing worked. I was so depressed. The computer was so fast, and so perfect, except that it sounded like a hair dryer. Tonight, in frustration, I finally just gave up and was resigned to buying a new motherboard and pulling apart the whole computer to replace it. It would be a terrible task, but would have to be done. I closed up the computer case and then walked away. Then, I decided to fire it up one more time to see what the fans sounded like with the case closed. I booted up and it was quiet. That had happened before, but then quickly went away. So, I waited. And waited. And waited. Nothing...silent fans. I monitored SpeedFan and everything was fine- speeds were constant or even lowering. I waited an hour and nothing changed. It was fixed!!! I couldn't believe it. Is it possible that the fan sensors are sensitive to conditions caused by having the case open? Possibly. Is it possible that every person complaining online was in the middle of computer work like I was and had their case open? Possibly. I was floored, relieved, and totally thankful. I praise God for this unexpected turn of events in a really frustrating week, and I'm so glad that I can return a nicely functioning and quiet machine to Wayne.