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I turn on my computer but the fan of the processor turn on then turn off

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Nay time nopower on

Posted on Nov 01, 2010

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1) Clean the inside of the computer. Power unplugged to computer, Anti-Static Precautions used, use a can of air, or two, to clean.
(Compressed air for computers)

2) Computer case open, computer plugged into power, turn the computer on, observe the cooling fans.

A) Processor: A processor may have it's fan sitting on top of the finned Heatsink, which sits on top of the processor,

OR, the fan may be a computer case fan in the Front of the computer, and uses a plastic tuned port to deliver air from the fan to the Processor.

In either case observe the rotation of the fan. See if it seems to be spinning at the correct speed. (RPM's)

See if it spins intermittently. Spins a few times, then slows down, or stops, and then spins again.

3) Check the Thermal Paste.
If the thermal paste in-between the top of the Processor's case, and the bottom of the Heatsink, has dried up, the Processor will overheat.

If a Thermal Pad is used, remove it, fly it at the cat like a Frisbee. They are J-u-n-k.

Clean the top of the Processor's case, and the bottom of the Heatsink, THOROUGHLY, and Properly apply fresh, new thermal paste.

For additional questions post in a Comment.


Dec 09, 2011 | E-Machines eMachines Desktop PC

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What would cause my aspire 5630 to shut down sporadically?

Shut down sporadically, caused by rising temperatures on the processor (processor overheat). Processor overheat, caused by damage to the processor fan. Processor fan function to reduce the processor temperature.

Possibilities and solutions
1. The possibility of sluggish processor fan. Processor fan spins, with a low speed, so it can not reduce the processor temperature.
Solution: clean the processor fan with a vacuum cleaner, or replace the processor fan.
2. The possibility of fan processor die.
Solution: replace the processor fan.

The characteristics of damage to the processor fan
After the laptop is turned off (more than 1 hour), the laptop can turn on and survive + - 30 minutes. In the period of + - 30 minutes, the laptop died suddenly, because the processor temperature exceeds safe limits (shut down temperature).

How to check
Laptop is turned off (more than 1 hour), then turn on. Download and install software to check the processor temperature. Ex. Real Temp 3.60. See the change in temperature. If the temperature continues to rise, it can certainly cause damage to the processor fan.
- Normal temperature, when first turned on + - 38oC
- Normal temperature, after turn on for hours 40oC - 45oC
- Temperature overheat processor, when first turned on 60oC - 65oC

Nov 18, 2011 | Acer Computers & Internet

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There are 2 basic fans in Dell tower one for the power supply and the other for the Processor. If your computer is not booting then the Processor fan is most likely to be the culprit. What could be happening is that the Processor fan is no longer turning fast enough to cool the processor, so normal the processor when it over heats there is either protection to switch off the computer automatically or the computer won't boot. The best thing is to change the fan and make sure it is working properly but checking on the cables that they won't entangle on top of the fan to impede it's movement. You can easily damage your processor if the fan is not working properly.

Oct 18, 2011 | Dell Dimension 8400 PC Desktop

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I have an assignment from my lecturer,need me to described about how to troubleshoot the processor....can you help me??i have no experience in this topic...

This one is kind of difficult but a processor is a pretty obvious problem to identify, it is likely the processor if:
  1. The computer power comes on (fans and lights) but the screen is black (does not boot)
It's not the processor if :
  1. You turn on the computer and see a boot screen.
  2. The power does not come on at all (no fan movement/lights)
Hope this helps!

Mar 14, 2011 | Computers & Internet

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Why my computer shut down every 2 hours

right click on the desktop click on properties select the screen saver option in this option u can see the power option and selcet never option of turn off hard disk and standby options.

Nov 15, 2010 | Computers & Internet

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My computer went blank when turning it on

1) Computer isn't working, due to the Processor isn't working, due to a bad Power Supply.
Weak voltage power rail.

Enough power perhaps to light LED lights, and maybe spin fans, but not enough power to turn the Processor on.

Computer Power Supply's are rated in Wattage.
Volts times Amperes = Watts.
(Average computer power supply in a fairly new computer, is rated at around 300 Watts)

A) ALL of the LED lights combined, use less than 1 Watt of power.
B) EACH fan uses 2 to 3 Watts.
C) A typical Processor may use 51 to 125 Watts.
Depends on what Processor it is.

Power Supply with a weak voltage power rail, can have enough power to light LED lights, spin fans, but not enough to turn the Processor on.

Test the voltages of the Power Supply,

Or, use a KNOWN to be good Power Supply, that has the correct amount of power cables, the right kind of power cables, the correct size, and shape of the case, and enough Wattage, for a test unit..

A bad Power Supply is one of the leading causes of computer failure.

Sep 19, 2010 | Computers & Internet

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My pc turns itself off as soon as I switch it on,

If the Processor fan is the one making the noise, it's the problem. (Fan bearings are bad)

A processor operates within a certain temperature range (Thermal range)
If the Processor becomes too hot, BIOS turns the Processor off.

This is a built-in Fail Safe feature, to keep the Processor from burning up. (Literally)

The Processor fan, (Sitting on top of the Heatsink, which in turn sits on top of the Processor), must be spinning, and MUST spin at a certain speed.
(RPM. Revolutions Per Minute)

The Acer Aspire E380-UD420A desktop computer, uses an AMD Athlon 64 X2 4200+, processor.

AMD's run H-O-T!
An AMD processor will burn up in less than 30 seconds, without proper cooling. (Intel's last much longer)

Suggest you replace that fan Pronto, if this is the fan in question!
A Fan/Heatsink combo may be easier to find than just the fan.
The AMD Athlon 64 X2 4200+ processor, uses a Socket 939 processor socket,

Information on the Socket 939 processor socket,

When buying a Fan/Heatsink combo, you look for what processor socket the processor uses. Then you look at the physical dimension size of the Fan/Heatsink combo, and determine if it will fit.

As you can see from inside your computer, the Processor sits sideways when mounted.
Therefore, you have to look at the Height of the Fan/Heatsink combo, to see if it will fit in the case.

You also have to look at the Width, and Length. There may be Electrolytic Capacitors on the motherboard, or Ram Memory module/s, or some other hardware components in the way, that may only allow a certain Width, and Length.

Just one example, of a Fan/Heatsink combo for a Socket 939 processor,

Be sure the computer is unplugged from power, before reaching inside the computer.

Also be VERY sure to observe Anti-Static precautions.

Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware components, inside a computer. You probably won't even see it, or feel it.

Computer unplugged from power, computer case open, TOUCH the metal frame of the computer case, to relieve your body of Static.

IF, you get up, and walk away in the middle of working on your computer, upon your return TOUCH the metal case again.

Processors are the MOST susceptible hardware component inside a computer, to Static shock.

An average Heatsink is composed of a flat plate of metal, with tall fins protruding from it.

Heat is absorbed from the top of the Processor's case, to the metal plate, whereupon the heat is absorbed by the tall, thin fins, and radiated away.

The Processor fan pushes air in-between the fins, and helps carry the heat away.

The top of a Processor's case, and the bottom of a Heatsink, are not perfectly smooth. A microscopic view would reveal 'Pits, Valleys, and Hills'.

These imperfections create an air pocket.
AIR is an Insulator, not a Conductor.
Air does not conduct heat very well.

Thermal paste is a compound made to fill the above mentioned imperfections. It is an excellent Conductor.
It ABSOLUTELY must be used!

Do Not reuse old thermal paste. The properties of the paste break down over time. Even if the thermal paste looks to be good, don't.

The cost of good thermal paste is very little. $2 to $4 from a 'Mom and Pop' computer store, $6 on up online.

The top of the Processor, and the bottom of the Heatsink MUST be thoroughly cleaned. I use an old plastic credit card (Anti-Static, and won't scratch the processor case), to clean these areas.

I then follow with Q-tips dipped in Isopropyl Alcohol.
(Rubbing Alcohol. 91 percent alcohol is best, but 70 percent will do. NO to 50 percent. It's 50 percent water, 50 percent alcohol.

Isopropyl alcohol is Extremely Flammable!
Use in a Well ventilated area, with no sparks, or flames present)

Takes a few Q-tips dipped in alcohol to remove the gooey mess of the old thermal paste.
How clean does it need to be?
Clean enough to eat off of.

Post in a Comment.

May 14, 2010 | Acer Aspire E380-UD420A (ASE380-UD420A)...

1 Answer

Lenovo ThinkPad X300 - how to replace the fan

The CPU fan? (the one infront of the processor?)
Standard CPU fans have clips, most of them have instructions on motherboards handbook.
You may try putting some thermal compound @ the surface of the processor, the reason why your computer turns off after boot up is that it the processor overheats.
Thermal compound is cheap, another fan will cost you more (and of course buying a new fan will require you to also buy a thermal compound so you would have something to put after removing the old fan)

Feb 15, 2010 | Computers & Internet

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CPU Fan Doesn't Spin

First time that I had heard of a Sony Vaio VGC-LS1, so I had to go take a look. Pretty Cool!

I can only tell what I think from a tech standpoint of view on it's processor fan.

1.This computer is housed in a housing that incorporates the LCD screen also. It's set up just like a laptop, except the LCD screen is in the body. (Housing)

This means you not only have the heat of the processor when it's running, you also have the heat of the LCD screen.
Plus it's all packed into one tight 'box'.

Processors give off a lot of heat by themselves. If they aren't kept to a certain thermal limit, they will burn up. Literally! Like ON FIRE!

When a processor goes beyond that thermal limit, there is a built-in Fail Safe feature that turns the processor off.

In ANY computer I've seen, or worked on, the processor fan is constantly spinning. As the load for the processor increases, so does the heat given out by the processor, and the fan spins faster.

It is my contention that you have a bad processor fan. I would at least ask a tech in your area, and see if this is so.
If your computer is turning off on you while you are using it,
you have a bad processor fan.

Apr 13, 2009 | Computers & Internet

1 Answer

Computer turns on but no Video and doesn't go through POST.

Before you "fry it" try taking the CPU fan off of the processor, remove the processor, reinsert the processor and CPU fan and see what happens.

Nov 11, 2008 | Biostar M7VIG-400 (M7VIG 400-COMBO4)...

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