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Old 09-14-2009, 04:51 PM   #1
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Default Dell 8400 Dimension Motherboard replacement question

Computer: Dell Dimension 8400 with an Intel Pentium 4 processor

Problem: “Revving up” noise

Question: Can I change the motherboard?

Hello. My computer skills and knowledge are limited. I’ve replaced the power unit before and reseated my heatsink. I also put in a DVD/CD drive into my Nana’s computer. Basically, I know how to open it up and unplug things.

I have a problem with my computer “revving up.” I reseated my heatsink and nothing happened. I also cleaned it out. So now I’d like to replace the motherboard as my research has led me to believe that that is the problem.

Here is the link http://www.honda-tech.com/showthread.php?t=2635459 regarding my “revving up/loud noise” ordeal.

My question is: Can I just buy a used motherboard, or does it have to be Dell specific? Or do I have to buy a brand new motherboard, or am I doomed altogether?

Thanks for your advice and comments. They are much appreciated.
-JT$
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Old 09-14-2009, 04:57 PM   #2
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Default Re: Dell 8400 Dimension Motherboard replacement question

Dell's motherboards and power supplies are Dell specific. I suggest you just replace the fan with a less noisy one. I have an inkling it's similar to my GX280 fan with is 92x92x32 (or something very close to that for the last dimension).
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Old 09-14-2009, 05:19 PM   #3
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Default Re: Dell 8400 Dimension Motherboard replacement question

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Dell's motherboards and power supplies are Dell specific. I suggest you just replace the fan with a less noisy one. I have an inkling it's similar to my GX280 fan with is 92x92x32 (or something very close to that for the last dimension).
LOL. I was hoping you'd respond. So you don't think it's the motherboard? And also, please forgive my incompetence, but that loud noise is just the fan?

Could I purchase this and replace it? http://cgi.ebay.com/Dell-Dimension-8...#ht_1031wt_958
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Old 09-14-2009, 06:03 PM   #4
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Default Re: Dell 8400 Dimension Motherboard replacement question

Oh yeah, it is most certainly the motherboard.

The problem is it reports a false temperature reading and screws it up, the taking off noise you hear is in fact the fan. The stock one is a noisy *** mother ****er. I've purchased this one:

http://www.newegg.com/Product/Produc...82E16811999603

Note how quiet it is. You can open up the case and put your hand all over the heatsink. I don't think you'd have issues with replacing the fan but may want to hold off until I get mine in haha. Some time awhile back I think I tried to swap it and it wouldn't boot because it didn't detect a fan.
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Old 09-14-2009, 07:25 PM   #5
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Default Re: Dell 8400 Dimension Motherboard replacement question

Sweet. Please install it soon and let me know how it goes. If I were to get a hold of a used Dell Dimension 8400 motherboard could I just switch them out?
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Old 09-14-2009, 07:51 PM   #6
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Default Re: Dell 8400 Dimension Motherboard replacement question

Technically yes, but all of them have the same problem. You'd probably just be swapping a bad one for a bad one most likely.

The *optimal* solution would be to buy/build yourself a new desktop for how cheap they are, **** there was a Dell with monitor with 4gb ram and what not for under $400 shipped. GK linked to it in a thread.

The ghetto/cheap solution is to buy a less noisy fan so that even if it does rev up you can't hear ****.
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Old 09-14-2009, 08:20 PM   #7
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Default Re: Dell 8400 Dimension Motherboard replacement question

Sweet sauce. I'll just wait to hear how yours works with the new fan. I'll bug you in a week or so. Thanks for all of your help.
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Old 09-20-2009, 10:18 PM   #8
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Default Re: Dell 8400 Dimension Motherboard replacement question

Updated.

I just swapped it out. The Dell has a proprietary connector (red-black-blue-white)

Red - power
Black - gnd
white - yellow (rpm)
blue - ignore

Reuse the stock Dell connector on the motherboard (I left about 3 inches of wire on it) and cut off the 3 wire fan connector and solder together. No fan error message either
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Old 09-21-2009, 09:40 AM   #9
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Default Re: Dell 8400 Dimension Motherboard replacement question

Running a test now with the fan all soldered in and doing a video encode (DVD vob files to AVI) that caused the fan to go off the charts before. So far so good.
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Old 10-19-2009, 09:04 PM   #10
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Default Re: Dell 8400 Dimension Motherboard replacement question

Sorry for my time delay, how did everything turn out?

My update: My computer has stopped crashing and runs smoother since I cleaned it out and re-seated the heat sink. My fan still takes off like a 747 everyday though.
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Old 02-16-2010, 12:12 AM   #11
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Default Re: Dell 8400 Dimension Motherboard replacement question

Update: TheMuffinMan said it worked out fine. I just ordered mine off eBay for $8 shipped to my door. I've never installed a computer fan before but I'm sure I'll figure it out.

Thanks again to TheMuffinMan for all of his help!

-JT
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Old 02-16-2010, 01:49 AM   #12
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Default Re: Dell 8400 Dimension Motherboard replacement question

lol i usually take the fan apart, lube it up with some graphite and reassemble.
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Old 02-16-2010, 08:32 AM   #13
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Default Re: Dell 8400 Dimension Motherboard replacement question

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lol i usually take the fan apart, lube it up with some graphite and reassemble.
Yeah Yeu, problem is that's not what's causing the noise. The fan itself just has off the chart dB ratings on it. The fan controller is messed up and causes it to go full speed which is just ridiculously loud. I bypassed that and it runs the fan full speed all the time but at a much more quiet level.
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Old 02-16-2010, 01:25 PM   #14
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Default Re: Dell 8400 Dimension Motherboard replacement question

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Originally Posted by TheMuffinMan View Post
much more quiet level.
I can't wait! I am seriously mad ******* the street for the UPS lady. I've had this problem for over 6 months now. "It's sucking my will to live!" - Garth

-JT
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Old 04-05-2010, 06:06 AM   #15
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Default Re: Dell 8400 Dimension Motherboard replacement question

I just installed my fan. I've been busy these past few months.

First run: It's much more quite. I tried running a bunch of programs to simulate the last scenario when the fan would come on and "take off."

So far so good.

The install was much easier than I thought. I just cut the wire, spliced them, soldered the wire together, and luckily, had some shrink loom to make it look professional.

I waited so long because I was timid of doing this kind of procedure on my computer. I didn't realize it was as easy as wiring a stereo system. Super simple.

TheMuffinMan: You're so awesome!

If it all goes as planned and remains quite...I'm going to kick myself in the butt for taking almost a year to find out the problem, order the part, and remedy the situation. LOL.

-JT
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Old 04-06-2010, 09:36 AM   #16
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Default Re: Dell 8400 Dimension Motherboard replacement question

Last update: Thank you all.

I ran my computer all day, ran a bunch of programs, and left my computer on overnight. A day ago that would have kept me awake and insane. However, in the morning, it was still silent. Thank you so so much!

-JT
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