Question about Dell Dimension E521 AMD Athlon 64 X2 Dual-Core 3600+ , 1 GB DDR2 SDRAM , 250 GB EIDE SATA H... PC Desktop

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Noisy fan Fan motor is mounted vertically with a shroud around it in front of machine blowing across processor

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  • jjoejr Feb 28, 2009

    Sorry, okay here's the problem. This fan has 4 wires on it. Normally the fan makes no noise at all. Here in the last week or so I come up on the computer and the fan seems like it has kicked in to high gear. No doubt it is turning faster and blowing more air. This is the first time I've noticed this. Makes more noise also. Not normal noise but distracting noise. I can turn it off and then back on and poof, the fan is back in low speed. I don't know if its the fan or the sensor kicking it into high gear. It's erratic. Sometimes you can turn it on and off and fan reappears in high speed, and sometimes it doesn't. Tried loading up machine in low speed to make it kick in, but that doesn't do it either. What determines the speed of this fan? Thanx

  • jjoejr Feb 28, 2009

    CPU fan in shroud standing vertically in front of CPU near opening of computer. Apparently it's a variable speed fan and kicks in on high temperature.

  • Thomas F. Schneider May 11, 2010

    OK . And ? What is the problem with the fan?


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Usually the heat sensor on either the CPU or the mother board through the BIOS software ajusts the sped of the van. Are you talking about the CPU fan , The Main case fan or the power supply one? 

Posted on Feb 28, 2009

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Fan is too loud

Every computer comes built with a processor cooling fan system.
The fan's main function is to keep the processor from overheating.
After long periods of use, processor fans can start to malfunction.
If your eMachines computer's fan is excessively noisy, it will need some maintenance.
If you don't deal with a noisy fan promptly, your computer's processor could overheat and cause significant damage to your motherboard as a result.

WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL. - rules
Only work inside the computer case when the power has been switched off and disconnected. Never open the power source.
Some of the below steps recommend removing physical parts within the computer.
While in the computer it is highly recommend that you be aware of ESD and its potential hazards.
Power down the computer.
Disconnect all cables and peripheral devices from the computer's back panel.
Rotate the computer so the back panel is facing you. Lay the computer on its left side.
Remove the Phillips thumb screws that fasten the right side access panel to the computer's frame.
Remove the side access panel from the computer to reveal the motherboard and all internal components.
Locate the cooling fan assembly near the center of the motherboard.
Remove all Phillips screws fastening the fan to the motherboard.
Disconnect the fan's power cable from the motherboard.
Then lift the fan out of the computer.
This will reveal the processor chip.
Place the fan on a flat work surface with the label sticker facing upward.
Use a thin, flat-head screwdriver to peel away the label sticker from the fan.
This will reveal the access hole to the fan motor's bearings.
Apply one to two drops of lightweight mechanical oil into the fan motor's bearings.
Replace the fan's label sticker.
Use a can of compressed air to spray the dust and debris from inside the fan blades.
Place the fan back into the motherboard on top of the processor chip.
Replace the retention screws and reconnect the fan's power cable to the motherboard.
Replace the side access panel and its two retention thumb screws.
Place the computer tower vertically, and then reconnect all cables and devices to the computer.

Nov 18, 2013 | eMachines EL Computers & Internet

1 Answer

The fan is very noisy

arrifai247 you probably notice the noise level goes up from level 1 to level 2 as well; this is normal. But is the change from level 2 to level 3 noisier now than when it was new? It might simply need a thorough cleaning. Or a screw may have come loose, especially if you feel the noise is a vibration or shudder of some kind. Sometimes the left and right rotation can become to extreme and it gets stuck or makes more noise at one extreme or the other. Then you might twist the top a little to the opposite direction. Also, if you are handy, you can probably open the cover over the motor and use an can of air duster spray to blow out any dust that has accumulated there. Always have the fan unplugged before proceeding of course. And be sure not to overtighten any screws when you replace them. As a last resort, especially if the fan is very old, you can spray a little fine machine oil (like for bicycles/ WD40) in and around the motor axle; don't overdo it, and clean up any excess with a paper towel or tissue. Don't think abot buying a new part if something like a blade is cracked and causing the noise, it would probably be more cost effective to buy a new fan. Good luck.

Nov 23, 2012 | Computers & Internet

3 Answers

I was cleaning me pc and forget what way the 2 fan go inside one blowing in and the outside is blow in to and my friend is telling me that the one on the outside sould be blow out not in what way...

Generally the purpose of a chassis fan on a desktop is to cool the machine. If there was only one fan it should be blowing out. If you have 2 fans then at least one should be blowing out.

(Assuming that the second fan that is blowing in is not allowing dust into the chassis of the computer.)

Hope this helps

Mar 16, 2011 | Systemax Tiger (SYXS-DC-1000) PC Desktop

1 Answer

My pc whines when i play a video or game or louder when uploading a video and play games.

A) Processor fan speeds up to cool the Processor.
Gaming, a video, and uploading requires more Processor 'power'.

A Processor has a Thermal Limit. A temperature it can reach, and no more.
Going past this thermal limit would burn the Processor up.
The Processor fan speeds up, to keep the Processor below this thermal limit.

(If the Processor temperature exceeds the thermal limit, the Processor is turned off. BIOS turns it off)

The Processor fan is usually one of two methods used.

1) A fan sitting on top of the Heatsink, which sits on top of the Processor's case,

Typical Heatsink/Fan combo,

2) A computer case fan in the front, that pushes air through a plastic shroud, which envelopes the Heatsink, sitting on top of the Processor.

Perhaps the fan's bearings are going out.

Bad fan bearings will let the fan shaft tilt to one side, and the fan's center hub will scrape on the fan motor.

This can cause a whining sound.
(Goes for examples 1 and 2 above)

Computer unplugged from power, Anti-Static Precautions observed, see if you can gently rock the fan's blades up, and down.
NO perceptible movement should be observed, nor felt.

If so this fan needs to be replaced.

If the inside of the computer is dirty, the added 'Gunk', (Dust, dirt, hair, you name it), will cause the fan blades to be unbalanced.
This will make the fan tilt to one side also.

Computer unplugged from power, Anti-Static Precautions observed, computer case open, use a can of compressed air for computers, and clean the inside of the computer out.

May require two cans.
May also require that you use Q-tips to disturb the outer layer of the 'Gunk', so that the can of air can remove it.

(Would also like to add:

The can of compressed air for computers comes with a plastic 'straw'.
The straw is attached to the nozzle of the can of air, when using it.

A Power Supply should have the inside of it's case cleaned also.
The cooling components for a Power Supply, are it's fan, and internal Heatsink's used inside.

[ Typical construction of a Heatsink is a plate of metal, with tall, thin fins protruding from it.

The plate of metal absorbs heat from whatever object it is placed against, and the tall, thin fins absorb heat from the plate of metal.

The tall, thin fins then radiate the heat away.

If a fan is used in conjunction with a Heatsink, (Such as a Power Supply, or Processor), the air flow from the fan helps to carry heat away from the fins ]

When the fan blades, center hub, and surrounding shroud are coated with Gunk, and the Heatsink's inside a Power Supply, their cooling capacity drops TREMENDOUSLY.

This causes the Power Supply to overheat.
Heat = Wasted Energy.

The Power Supply strains to keep up with the call for power, and eventually cannot.
Components inside the Power Supply fail, and the Power Supply fails.
(As in Kaput)

The Power Supply's case has ventilation holes, on the case side inside the computer.
The plastic straw of the compressed air for computers, is inserted into the top ventilation holes, and air is shot in. (One ventilation hole at a time)

The straw is aimed in a slightly downward fashion.
Then the straw is used in the lower ventilation holes, and then on the bottom ventilation holes.

HOLD onto the plastic straw with one hand, and the compressed air for computers with the other hand.
The straw can shoot off of the can of air's nozzle, and wind up inside the Power Supply's case.

This = NO

No go to the back of the Power Supply, and use Q-tips to get into the crevice where the fan blades meet the center hub.

Also on the edges of the blades, and the surrounding shroud around the blades.

You just need to disturb the outer layer of Gunk, so the air can remove it.
Shoot air past the fan into the Power Supply case also.

You won't get the inside of the Power Supply perfectly clean, but you will extend the life of the Power Supply greatly.

The inside of the computer, and the inside of the Power Supply, should be cleaned on a regular basis as needed.

Different scenarios require more frequent cleaning, or less frequent cleaning.
Only you will know, when you check inside your computer on a regular basis.

You can be the best housekeeper in the world, but even in pristine homes, and businesses, the inside of a computer, (And Power Supply), gets dirty.

(Carpet deodorizer can clog a computer too. It's a fine dust)

If the inside of your computer is kept pristine clean, and you have No fan bearing problems, then your Harddrive is on it's way out.

This explains the workings inside a Harddrive,

(The Spindle motor's bearings are going bad )

Sep 20, 2010 | Dell Inspiron 531s Desktop Computer

1 Answer

How to adjust my computer fan

This is one program,

Would like to state though, be sure the fan in question isn't spinning at a high rate, due to a fault within the computer.

1) Computer is dirty inside.

A) Fan for the Processor, and Heatsink on the Processor, are dirty, causing the Processor fan to operate at a high rate.

[Some computers have a fan mounted directly on top of the Heatsink, sitting on the Processor.
Some computers use a computer case fan to push air through a plastic shroud, which envelopes the Heatsink.

Typical Fan/Heatsink combo, ]

Computer unplugged from power, Anti-Static Precautions taken, use a can of compressed air, (Or two if needed), to clean the inside of the computer.
Don't forget to clean the inside of the Power Supply.

[Using the plastic 'straw' provided, (Should be used at all times), insert the straw into the ventilation holes of the Power Supply's case.

Suggest starting with a hole located towards the top of the Power Supply's case, and directing the air flow towards side to side, and top to bottom.
Then move towards the bottom ventilation holes.

Come towards the back of the Power Supply, and clean the Fan's blades, and center hub. Also the surrounding shroud around the fan's blades.

If you find heavy 'gunk', (Dirt, dust, etc.), that the compressed air won't remove, suggest you use Q-tips.
You don't have to remove the 'gunk' with the Q-tips, just 'disturb the surface' of the gunk with them.
Then follow with air.

2) Thermal paste in-between the top of the Processor's case, and the bottom of the Heatsink, has dried up, or partially dried up.

Another situation that causes the Processor to overreach it's thermal limit, and cause the Processor fan to operate at full speed.

Computer unplugged from power, Anti-Static Precautions heeded carefully, the top of the Processor's case, and the bottom of the Heatsink are cleaned THOROUGHLY, and then new, fresh thermal paste is correctly applied.

3) Some fans have four wires.

A) One for the Positive connection,
B) One for the Ground, (Negative) connection,
C) One for the sensor that monitors the RPM, (Revolutions Per Minute) of the fan,
D) And the last wire is a sensor wire, that allows the computer to vary the RPM's of the fan's speed, as needed.

Ensure that the connection of all four wires is tight, and especially the sensor wire connection. A loose connection will cause an out of control fan speed.

Some programs, such as an intensive game, will cause computer case fan/s, and a Processor fan, to operate at high speed.
A necessary thing to keep the Processor from overheating.

For any questions you may have regarding what I have stated above, please post in a Comment.
Would appreciate hearing back from you.

Sep 15, 2010 | Computers & Internet

2 Answers

Mt dimension 3000 gets very noisy when the weather

That's because it heats up more easily and faster, which usually makes the fans spin faster and results in being noisy. Have you ever cleaned out the interior of the computer? If not, or if it's been awhile since it's been done, then buy some canned air for dusting electronics, open the side of the computer case (while it's not powered ON), and blow out the fans and the heat sink. If you get alot of just clogging up the heat sink, then it will not dissipate heat correctly; which results in the fans running more often. It that doesn't help any, then I would try to figure out if one of the fans is making alot of noise because it's going bad. You can find replacement fans on ebay, or at local electronics\computer shops.

Apr 10, 2010 | Dell Dimension 3000 PC Desktop

1 Answer

How to install fan in dell 2400 desktop computer

Rear computer case fan?

This is going to be a fairly long solution. Advising you in advance.

1) Computer off, and unplugged from power.

2) Open the computer case, TOUCH the metal frame BEFORE you reach inside. Your body carries Static electricity. Touching the metal case will relieve your body of Static.

3) Remove the Processor Air Shroud.
This is the plastic U shaped part that covers the Processor, and Heatsink. It's at the back of the computer next to the computer case, and the fan in the rear.

First, unplug the fan's power cable from the motherboard connector.
(J30 connector on motherboard.
In-between Ram slot 1, and the Processor)

Second, you may have to disconnect the power cable for the Processor, in order to remove the Air Shroud. Disconnect the Processor power cable from the motherboard.

(J10 connector. Square connector on the motherboard to the left of the Processor, and down. There is a power cable from the power supply that goes to it, with a square connector, and has four wires in the cable. Two Yellow, two Black wires)

You may have to disconnect the 20-pin ATX main power cable also, in order to have room to remove the Air Shroud.

(J21 connector on motherboard. Long connector with 20 socket holes in it. It's on the outside edge of the motherboard, to the right of the ram slots.

The power cable connector is a Male connector. The connector on the motherboard is a Female connector.
The Male connector has a lock tab on the side of it. The tab is hinged so that it pivots. The top of the tab is squeezed in to release the lock.

This action draws a hooked end of the tab, out of the Female connector on the motherboard. While keeping the tab squeezed, the Male connector is gently wiggled side to side, while pulling up, and out.

Do Not pull on the wires, pull on the Male connector only. Use a gentle force)

The Air Shroud is gently squeezed in on the sides, with your fingers, and thumb. (Side that is towards the Front of the computer)

Then the side of the Air Shroud that is towards the front of the computer, is lifted up.
The Air Shroud pivots towards the rear of the computer.

The Air Shroud pivots on two round pins. Pins are made into the plastic shroud itself.

Each side of the air shroud, is gently pried out on the bottom where the round pivot pin is, and this action draws the pin out of the rear fan's mounting flange.
Remove the Air Shroud, sit it aside.

Now you can look more closely as to how the fan's mounting flange is attached to the computer case.
At this point I cannot lead you directly, only guide you.

The fan's mounting flange, may have small flat protrusions coming out of it, that go through the rectangular ventilation holes, in the rear of the computer case.

The flat protrusions has a hooked end on them, that hooks on the edge of the ventilation hole. Usual style, requires that you push the hooked end, towards the inside.

(Reference is made in relation to the outside edge of the computer case. The hooked end is pushed towards the middle of the computer case)

It may be a style of mounting flange, where the flange's edge has a lock tang that sticks up.
This lock tang is part of the plastic mounting flange itself.

The lock tang is depressed towards the computer case, and the fan is slid up, and out of a metal bracket.
(May be more than one locking tang)

Observing the mounting flange for the fan, you should be able to see how the fan itself, is attached to the mounting flange.

Usually it's another form of locking tang that is used.
The locking tang, or tangs, are depressed, and the fan slides out of the mounting flange.

If you did not buy a replacement fan directly from Dell, (Don't even know if you can), observe the fan's power cable connector.

Observe where the wires go in the connector. Look at the color code of the insulation of the wires. Match this wire color code, to the original Dell computer case fan.

Are the wires in the same place as the Dell fan?
If not, tell me. Post in a comment.

Jan 24, 2010 | Dell Dimension 2400 PC Desktop

1 Answer

Hi I have a HP Pavillon a708 and the fan is almost constantly on. It's really noisy and seems to slow the PC down, is there anything I can do??

First, open up the case and gently vacuum all the dust, especially around the 2 fans.

If still noisy and the problem is the cooling fan (3-5 inches across), buy a replacement fan of the appropriate size at a PC store for $30 - $40. It takes 5-10 minutes to unscrew the old fan and install the new one, and just use the same electric wire from the old fan for the new fan.

If it's the CPU fan, you'll need to have your PC serviced.

Hope this helps.

Jul 09, 2009 | HP Pavilion a705w PC Desktop

1 Answer

How do I remove the fan shroud from a dell dimension 8300?

there are two clips one on the top and one at the bottom u have to press both the clips and open the shroud.

Jun 07, 2009 | Dell Dimension 8300 PC Desktop

1 Answer

Noisy fan - ~Dell Dimension 5150 (3 years old)

This issue is discussed here: Click Here
As for the fan check it inside the pc sounds like you may be missing a screw

Mar 07, 2009 | Dell Dimension 5150 (DIM515MIN) PC Desktop

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