Solved: Need help with noisy computer, please!

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Chris C.

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Oct 13, 2008
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hello!

the fan on my Dell pc has always been pretty noisy, but lately it sounds like it's going to blow up - or like a semi truck shifting gears and driving over gravel. so.....i guess i need to replace it. my experience working on hardware is about as advanced as testing & installing sticks of RAM, so i need to ask for some basic guidance.

1. do i just order the same model that's already in the computer?
2. is this a simple plug-and-go job?
3. do i need to order this online, or does radio shack or other carry this stuff?
4. if online, are there any companies people would recommend?
5. i'm guessing i can't just swap one out of an old computer, then? ;)

thanks for any advice/help!
~chris
 

crjdriver

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First we need to know what fan is making the noise. Open the case and look [there are numerous fans inside the case; cpu fan, exhaust fan, power supply fan]

You can usually tell which fan is making the noise by taking a straw or long thin screwdriver and hold it against the fan body. Do not touch the spinning blades.

When you post what fan is giving you the problem, we can recommend a replacement.
 

Chris C.

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Oct 13, 2008
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oh, thanks - i didn't realize there were multiple fans.

i looked up the part number and it's the CPU heatsink fan. this is my part #: BG0903-B049-P0S
 

Chris C.

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Oct 13, 2008
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p.s. i can feel it "grumbling", and if i lightly press my hand on it, the noise becomes slightly more quiet/muffled
 
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Are any cables getting caught in the fan? This can cause a horrible loud grinding noise.

Edit: Sorry I didn't see the replies. Sounds like you've diagnosed the issue and crjdriver is helping you replace the heatsink fan.
 

crjdriver

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No, most likely you cannot just purchase a standard hsf [dell is proprietary]

Post the exact make and model of dell OR post your service tag# and we can try and find you a hsf.
 

Chris C.

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Oct 13, 2008
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thanks for jumping in matthewdownloads, and yes, crjdriver - that's the exact label that is on mine!

replacement questions:

sorry if this sounds overly basic, but do i just unscrew the screws and then unplug it? it looks excessively simple.

also, i saw that some come with (or without) the heatsink - do i need to replace the heatsink too? (i used to repair circuit boards a long, long time ago and i remember some kind of goop you needed to put on there - will i need to mess with something like that?)

long before my fan got all grumbly-grindy, i noticed it would always "rev" up especially whenever i was on a page with video or like a flash game (words with friends, etc) is this normal? it was awfully annoying, and i had to put the computer on stand-by to get it to 'calm down'.
 

crjdriver

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If you just want to replace the fan, then just R&R the screws and replace. If you want to replace the heatsink as well, then you will need to clean the cpu with 99% alcohol and use thermal compound.

The fan speed going up and down is controlled by the mb. When the system is under a load, fan speed increases. If it is more than a few years old, I would either replace the hsf or just pull it off and replace the thermal compound. In any case, make sure you blow out all of the dust from the heatsink. Use a can of air [available at any office store, computer store or even walmart]
 

Chris C.

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Oct 13, 2008
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109
thanks for the explanations!

i've been googling around for replacement parts and from what i'm finding, it sounds like there's a known issue with a faulty heatsink on the Dell Optiplex GX280 which is what i have. if anyone's interested, the issues described by the original poster in this thread sound exactly like what i had been experiencing up until it progressed into a grindy-grumbly problem. http://windowssecrets.com/forums/showthread.php/132593-Fan-Noise-Dell-OptiPlex-GX280.-SOLVED

LAST QUESTION...i watched a couple youtube videos on changing out the fan (good thing too, i was thinking the thermal compound had to be piled on) do i need to "ground" myself or do something to prevent static? usually i just open up the computer and start poking around.
 
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Jan 18, 2013
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hi chris
you need to "ground"yourself because static can damage the computer, first unplug you machine from the ac power, second ground yourself with something made of metal And third hands to the job!
 
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well i've seen the heat sink and its looks pretty good to me, but you had to notice that its a used part, if youre planning to buy you better buy a new one! if you are looking for something in particular just tell me the brand and the model and i look for it!!!
 

Chris C.

Thread Starter
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Oct 13, 2008
Messages
109
i took the old fan out to clean it and the heat sink......omg, it was covered in a cloak of dust. but cleaning it didn't help so i'm going to replace both.

can someone help me figure out how to remove the heatsink? i have the optiplex gx280 SD model and i got as far as removing the green clips, but the heat sink is setting in like a black plastic frame thingy (it's the frame that the green clips clip in-to). it doesn't look attached to anything else. there are little 'tabs' that prevent me from just lifting out the heatsink. it looks like i could pry it out, but that doesn't seem right. is there a trick?
 
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Heatsinks can be horrible to remove and they are all different. I know on mine you have to twist the black tabs keeping it pressed down. Hopefully crj or somebody can help you with yours.

Refer to the instruction manual that came with your CPU, or look it up on the internet. That will have detailed instructions of how to do this.
 
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