Turn on Closed Captioning if your fan is too loud to hear this! Just hit the CC button. These are great machines suffering a factory problem with having the fan reversed on the assembly line. You can fix this easily to allow you to love and trust your computer again. Now I use my airbed pump to blow dust out of it! Works great. Here's a guy who shows you how to do it step by step, but he left out the Arctic Silver part:
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WARNING ABOUT MY VERSION: An auxiliary fan is needed to cool the motherboard if you insist on leaving off the cover (like me), because the motherboard also has a heat sink (famous capacitor issues) underneath the hard drive that needs air moving over it. It's the 2" by 2" by 1/2" square radiator, not the larger one used by the CPU. I have since this video completely unhooked the big blue plastic holders and set my hard drive to the side for getting air to that small heatsink with the lid removed because I like it that way, but it will work for you with the cover on, which will force cooler air over the smaller heatsink. WITH THE COVER REMOVED, IT WON'T COOL THAT SMALLER HEATSINK WITHOUT THE EXTRA FAN SHOWN. Works great! I've seen blogs about hot air discharged from the power supply being sucked back in with the cover on, but that doesn't happen when it's sitting in a vertical position because hot air rises, so the vent in the back will work fine after you've turned the fan around and replaced the lid cover. (Just don't leave it lying down vertically).

The CPU heatsink is the big removable one needing Arctic Silver Thermal Compound, and the motherboard heatsink is the smaller silver-colored one hidden underneath (but clearly visible).

The main CPU fan has a slot for its wiring bundle clearly revealing its correct position as blowing air OUT instead of in. There's a big debate about this, but just take out the fan and LOOK at it. The channel in its plastic housing accepts the wiring for the fan to blow out. Really amazing. The rubber feet are NOT a good clue about its correct position because the fan's housing has holes on either side, so some factory manager directing workers to put the rubber feet in a certain side was simply mistaken. Sheet happens.

Installing the main fan the way it was designed (blowing out instead of in) solves its problem completely. But I haven't put the cover back on because I'm just more comfortable with it this way, having suffered such anxiety with all the thermal event horror. With the cover off, both fans (CPU and power supply) pull air from above instead of over the motherboard heatsink, so the cover does need to be closed, not like my setup. You can feel how hot the motherboard "radiator" gets if you have small fingers! (Not recommended for children). You can feel how hot the CPU heatsink gets, too.

So the fan's supposed to blow out, but leaving off the cover starves the smaller heatsink on the motherboard of cooler air, pulling air from up above instead of through an enclosed box, so if you're going to leave the cover off, get a small fan like the lovely Polar-Aire seen in the video.

Don't forget to unplug your machine before working on it, then hold the on/off button for a few seconds to ground the motherboard. (You'll see it light up momentarily).

I set my supplemental fan on top of the power supply, with one foot resting on the wiring bundle with the hard drive sitting off to the side, but any place seems to work as long as you're helping the motherboard get moving air. The system should work fine with the cover on if you’ve got the CPU fan installed properly now.

HINT: why is the sensor (the little thing taped onto the main housing underneath the fan) placed to measure air coming IN if the fan were meant to blow air toward the inside? So turn your fan around and feel free to put the cover back on. Hey, I love my Dell again! But what is that cup-shaped light supposed to be? An empty can? Let me know!

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