Question about Dell (Fan Only) M/N AFC0912DE, DC12V, 2.50A, D/N P2780 P2780

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I have a dell 8400 tower that operates just fine usually but lately there seems to be a fan issue where it sound like a jet engine and I am concerned that the fan will fail (it currently operates) and overheat my computer. I have isolated the sound and deteremined that the fan on the heat sink is going crazy and making a sound like a jet engine. I dont know if the fan is going bad or the motherboard is "telling" the fan to go in overdrive. Could it be software, motherboard, some other controller I am not aware of or simply the fan? Please help! Thank you!

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The bios monitors the processor Temperature and increases fan speed if its gets hot. I recommend, get a can of air and blow out the processor's heat sink, as it could be getting dirty and preventing air flow for cooling. otherwise you have some software that running the CPU at a high rate for a long period of time. Use control +alt +Del then switch to task manager, if you click on the CPU heading it will order the tasks by CPU usage, look for the ones that are at the top of the list. note:system idle process should always be way up there 95-100% CPU, this on is OK. all else look into. you can "end task" one the offensive one and look up more details on the web about that application. I look forward to your comments. Thanks

Posted on Aug 27, 2010

  • Trevor Groves
    Trevor Groves Aug 28, 2010

    Does my response answer your question? do you need further clarification or help? Please use the solution rating if your problem has been solved, make a note if your still having trouble.
    Thanks! Gurvy

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Dell 8400 dimension desktop on start up the fan runs at top speed like a jet engine taking off, and power light is constant amber with a blank screen. I have removed ram and grafics card etc and replaced...


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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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