Question about Dell Dimension 5150 (DIM515MIN) PC Desktop

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

I have a noisy fan and some processor hungry program which I can't find.
When the processor is on 100% - the fan spins really fast and rattles.
Are these problems connected or two separate issues?
Apart from the processor hogging problem (not continuous) - and the fan noise - the pc is working fine.
There seems to be several programs on the processes part of Task Manager called svchost.exe and one of them seems to be the processor hogger!
Thanks - June

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  • juney51 Mar 16, 2009

    Thanks for your reply. I'll try this and see what happens.

    Cheers

    Juney51

  • Shoib Chandran
    Shoib Chandran May 11, 2010

    Hi.there are also chances that infections also report as svchost in the task manager.Try loading the system in safemode by pressing the F8 key on the restart and then check whether it still gives the same issue.This mode doesnt allow much of the common infections to run.

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  • Master
  • 916 Answers

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

Posted on Mar 07, 2009

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Try to check the fan and the inside of the desktop for any dirty things in there. Especially check the fan to see if something is stuck!

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Should my fan run all the time on desktop dimension


Yes, the computer case fan, and the Power Supply fan should run constantly.

If this is in reference to a Dimension 5150, there is one computer case fan in the front. This fan pushes air through a plastic tuned port, (Shroud), onto the Heatsink, which sits on top of the Processor.

http://support.dell.com/support/edocs/systems/dim5150/en/sm/index.htm

The above link is to Dell Support, and the Service Manual for the Dimension 5150.
Technical Overview shows the inside of the computer.

Processor's have a thermal limit. Once they exceed this thermal limit, or temperature, the Processor turns off. (BIOS turns it off)
This is a Fail safe feature built-in to keep the Processor from burning up.

Desktop computer fans run all the time, unlike laptops.
However the fans should not run at full speed all the time.

If your desktop computer fan sounds like a 'jet engine' constantly, there may be internal hardware problems, for one.

1) It may be that the thermal paste has dried up.

The top of a Processor's case, and the bottom of a Heatsink are not perfectly smooth.
There are 'Pits, Hills, and Valleys'.

The above mentioned imperfections cause a void. This void is an air pocket.
Air is an Insulator, not a Conductor.

Thermal paste fills these voids, and is an excellent conductor of heat. Transfers the heat from the top of the Processor's case, to the bottom of the Heatsink.

Example of a typical Heatsink/Fan combo,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3451342&CatId=493

The Heatsink is the finned aluminum looking object under the fan.
(The Dimension 5150 does not use this kind of Heatsink/Fan setup. I included the link to show a typical Heatsink. The front computer case fan, pushes air through a plastic shroud which encases the Heatsink, in a Dimension 5150)

Solution is to Thoroughly clean the top of the Processor's case, and the bottom of the Heatsink, and correctly apply fresh, new thermal paste. (Average cost of thermal paste for this application is $6)

[NOTE*
Observe Anti-Static Precautions!]

2) If the inside of the computer is dirty, as well as the inside of the Power Supply, this will also cause the cooling fan/s to race at high speed.

Solution is to use a can, or two of compressed air for computers, and clean the inside of the computer, (Especially the fins on the Heatsink), and the inside of the Power Supply.

[Again, observe Anti-Static Precautions]

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1 Answer

Dell dimension 5150 the fan is really noisy and sounds like its going full blast all the time.we can hardly hear the telly over it.


Your fan is most likely in need of a cleaning, or straight out replacement. You can remove the retaining screws and pull the fan out as a complete unit and blow it out with a can of compressed air. If the noise is a high squealing sound, then I would purchase a replacement fan and install it. Fans can be purchased from Ebay, just remember to check and make sure that you are ordering the correct fan (case or heatsink) before you commit to buy.

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