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Dell PC Fan Running like a race car

Hi,

My Heat Sink fan, on my Dell Dimension 8400 model, is running like a powerboat in a race. The PC never boots. On occasion the fan will not run and the PC will boot up, but it will only run for a little bit, maybe 2-3 minutes before total freeze up.

Is this PC done for?

Thanks in Advance,
Darrick

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Hey Darrick, It seems that the fan is full of dust or gone bad. You can open the tower and use a compressed air can to clean out the fan. if cleaning it does not help call Dell sales and order a new heat sink fan.

Posted on Jul 28, 2009

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Posted on Jan 02, 2017

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Dell Dimension with E187242 stops running after variable times from 5 mins to 30 mins Running Win 7


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Check the CPU fan to see if it spins freely, if not replace the fan.
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Feb 05, 2013 | Computers & Internet

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When i turn on my dell dim 8400 the fan races very fast i have to power down and start back up sometimes it takes 2 or three times then starts to work but after awhile it freezes up or if i wiggle the...


Normally, when the fan gets loud and races, it means that the CPU is getting too hot. The normal fault is that the case and ventilation block on the CPU is full of dust.

Disconnect the tower and take it outside or somewhere where a bit of a mess isn't a problem. Open the tower and look inside. Is it full of dust?

Using a dry soft bristle paint brush, CAREFULLY liberate any dust and fluff, if you have a hoover, brush to the hoover to remove dust.

The CPU is under a big metal blob with a fan on the top, Underneath the fan there are a load of ventilation duct in a metal block. See if you can clean them out, compressed air in a can is a good way. In conjunction with the brush.

Check all the vents and fans are clear of dust, including the PSU.

Once done, try it again, does it still race / lockup / close down.

If so, then you may need to renew the heat dispersal grease which is placed between the CPU and the Heat sink (Vented metal block under the fan).

The best place to find how to do that is look on Youtube for CPU changing / fitting / upgrading.

Mar 26, 2011 | Dell Dimension 8400 PC Desktop

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You can find professional cleaning solution products at any good computer parts store, or you can rubbing alchohol (the less water content the better) use a lint free cloth like the kind to clean eye glasses.

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Dell Dimension 8400 Start up Fan Noise


Might be a hard drive issue. I had the same problem with one of My desktops. I replaced the hard drive and it worked fine.

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Dell 8400 runaway fan no diagnostic lights and very ocassionally it starts normally


Which fan?, the cpu fan or the cpu fan?

Most Dell pc come with a below average power supply. I recommend replacing your power supply with a better one. Do a search on Google for a good replacement power supply for you Dell 8400.

Please rate response.

Feb 17, 2009 | Dell Dimension 8400 PC Desktop

1 Answer

Dell Dimension 8400 won't boot, cpu fan running like a jet engine


don't worry pal just follow the steps (according to my expeience)

1) turn your computer on.
2) when it is being started keep pressing both DELETE keys (one of Num keys and other one.) without any interval.
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i do it on my PC like this only

Jan 12, 2009 | Dell DimensionTM 8400 PC Desktop

3 Answers

Dell Dimension 8400


I have this exact problem.

The Dell Dimension 8400 will seem to randomly go into fan-jet-turbo mode on power-up and fail to boot. The problem I'm referring to is not a heat problem which an over-speed fan might otherwise suggest but a hardware problem the details I'll get to in a bit

I've done all the normal and obvious stuff that has been reported before

remove/replace memory
remove/replace AGP video card
removed all extra power loading / drives / USB etc
BIOS tweaks/resets
check supply voltages with a DMM (I even re-adjusted the hipot to get the right voltage - it was a little low)

As an engineer it is important to determine root cause. Do to this it is necessary to find a way to make the problem occur and not occur. If you're able to do this you can fix it.

Well in my case the problem it related to a mechanical stress on the heatsink. What I mean is a little force pushing the heat sink toward the fan turns off the problem (boots normally) while a little force in the directly away from the fan turns-on the problem (fan-jet-turbo-mode).

The root cause is could one of several things, it could be a damaged motherboard with a broken trace, it could be a socketing issue,

The Fix (not really - just a band-aide) was to use a tie a couple of small tie-wraps through a some small holes in the heatsink then through the fan mounting holes.

Only slight pressure is necessary - too much will likely cause permanent damage. The fan is mounted on rubber isolators so it somewhat limits the force on the heatsink

Any this mechanical issue is somewhat supported but all the information I've read - how removing/replacing the CPU can fix the problem, changing memory, removing cards - all these mechanicall stress the motherboard and likely move the heatsink some.

Intermittent problems are the worst to debug!

Ross
San Jose, Ca

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Jul 02, 2008 | Dell Dimension 8400 PC Desktop

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