I was not familiar with your laptop so i went to research it a bit. It certainly sounds like you made a very excellent choice (over it's competitors in the class). I was particularly interested in the review comments re your heating issue. This is what the review said about that:
Heat & Noise
For the most part I was very pleased by the amount of heat and noise emitted by the D820. When idling or performing everyday tasks the fan speed is very slow resulting in relatively silent computing. When performing more demanding tasks (such as during the Battery Eater Pro burn-in and battery life test or rendering 3D graphics) the fan speeds up but it is not at all offensive. The only caveat is the Philips DVD-RW drive. Compared to the rest of the notebook, it sounds like a turbofan engine spooling up when it reads a CD or DVD. Moreover, the drive is not well damped causing the whole notebook body to shudder as the drive spins.
Dell has designed the D820 for excellent heat dissipation. There are two exhaust vents: one on the side and one on the rear. The left wrist rest heats up a tiny bit after a long period of operation and the right wrist rest stays completely cool throughout. Touching the underside of the laptop after the ~2 hour Battery Eater Pro stress test I found that the laptop was warm but certainly not hot enough to preclude lap-top usage for an extended period of time. The power brick stays cool even after days of keeping the notebook plugged into the wall. In short, Dell has done a superb job of managing the heat emitted by the D820's high performance components.
So as you see what you are experiencing is far from normal and what you should be experiencing. You mentioned that you just had it "cleaned". Was that the reason that you had it cleaned due to the heat issue/ Or has this only occurred since you had it cleaned? Given your investment i would want to be dealing either with Dell or a very qualified computer repair shop. Have you done a heat test on the computer to find out what actual heat measurements you are getting? I don't think i would want to be going into the innards of that computer unless i was very familiar with doing that kind of thing. You have a fair chunk of change into it and i would not want to risk further damaging it. If your heat readings turn out to be excessively high i would stop using it until you resolve that issue. Have you tried the standalone heat reduction fan laptop cooler units?truenorth
