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Dell Dimension 8400 PC Desktop
Problem for Dell Dimension 8400 PC Desktop

Dell dimension 8400 fan runs at high speed upon




By lvang on Aug 19, 2009

" "
dell dimension 8400 fan runs at high speed upon power on. fan continue to increase speed very loud unable to power off with power switch
Comments:

Aug 19, 2009

- I was doing research on the internet. It says to replace the motherboard. Luther Vang
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Best Solution

posted on Oct 12, 2009
Very Helpful)

slafauci
slafauci

Rank: Apprentice 
Rating: 100%, 2 votes
I too experienced the Dell 8400 high speed fan problem. I purchased some CPU thermal compound, cleaned the old hardened compound from the CPU and heatsink with isopropyl alcohol and applied the new compound according to directions. This solved my problem.
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Solution #2

posted on Aug 19, 2009
Very Helpful)

jdensonjr
jdensonjr

Rank: Guru 
Rating: 87%, 13 votes
You need to replace the fan because it is bad and will only get worse until it no longer works. The noise alone says that it is bad. Any computer store will carry them for a cheap price, so no reason to worry. Good Luck.



Fehdi


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Solution #3

posted on Oct 12, 2009
Helpful)

bob_computer
bob_computer Expert Moderator

Rank: Guru  Dell Computer Hardware  Expert
Rating: 87%, 1268 votes
Your fan speeds up and slows down in response to temperature inside the computer. More so the CPU.

I would suggest getting a can of compressed air made for computers

take it outside, take of the side and blow all the gunk out of there, Really go to town around the fan (you might want to wear eye protection)
While you are in there just check that the CPU cooler itself is not loose

If it is it will have to be re-seated.

If it needs re-seating don't just take it off and put it back on as that might make things worse with your temperature problem they have to be cleaned and new thermal grease put on ($2-5)

DON'T remove the CPU just the fan/cooler assembly.

You must clean both the surfaces without scraping anything off. Use isopropynol alcohol and cotton bud sticks until both surfaces are clean, you can use your finger nail to scrape harder residue if you wish but nothing else.

DON'T pour the alcohol over the CPU

Now apply some new thermal grease (most computer shops have it)

Be careful about how much you put on

Here are some basic instructions

Once you have re-assembled your cooler and re-connected it check everything is OK and power up the computer.

If everything went to plan you should now be back in business
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