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  1. #1
    Member davidmmac's Avatar
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    Exclamation Computer making loud whirring sound

    Booted up my desktop computer this morning, went away for a about 5 minutes, came back, and it was making a loud whirring sound. Usually when it does anything like this it comes from the dvd drive, so I ejected it, but to no avail. Decided to reboot, but again, after about 3 minutes, a fan started up and it was making a racket, so I just turned it off. It sounds like it's coming from the back end of the computer.

    Any ideas?


  2. #2
    Computer Technician wainuitech's Avatar
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    Default Re: Computer making loud whirring sound

    Only two things that spin in a PC - the Hard drives disk and cooling fans.

    Its will be one of the fans, prob full of dirt, dust etc.

    Take the side off the case, turn on the PC and generally you can tell which fan is making the noise. locate the right fan and replace it. No real point in cleaning them, as crap gets in and acts like grinding paste - cleaning may quieten it for a while, but it will return again.

    It could also be the cooling fan in the PSU but more often than not its the rear case fan or CPU Fan.
    Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.

  3. #3

    Default Re: Computer making loud whirring sound

    Just cleaned out my computer with some compressed air and it's made a huge difference. It's much quieter.

  4. #4
    Member davidmmac's Avatar
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    Default Re: Computer making loud whirring sound

    Thanks Wainiutech

    That seems to have stopped it. I didn't track down the source of the sound, but I gave the back fan a clean and all now seems well. It's a bit rusty around that fan, is that normal?

  5. #5
    Crossmember feersumendjinn's Avatar
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    Default Re: Computer making loud whirring sound

    No, rust is not normal, sounds like you're drawing damp air through the computer (is it near a window, or the bathroom or kitchen?).
    The fan noise will come back, a good way to find the noise is to use a piece of hose (garden hose is good) as a stethoscope, one end in your ear/wave the other end near your fans to localise the noise.
    "...anyone who expects a source of power from the transformation
    of these atoms is talking moonshine..."
    - Ernest Rutherford (1871-1937)

    --------------------------

    Heck is a place for people who don't believe in gosh.

  6. #6
    Member davidmmac's Avatar
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    Default Re: Computer making loud whirring sound

    Quote Originally Posted by feersumendjinn View Post
    No, rust is not normal, sounds like you're drawing damp air through the computer (is it near a window, or the bathroom or kitchen?).
    The fan noise will come back, a good way to find the noise is to use a piece of hose (garden hose is good) as a stethoscope, one end in your ear/wave the other end near your fans to localise the noise.
    Thanks for the advice about the fans.

    I purchased the computer off Trade Me and it came with the rust, is it bad to have rust? Should I consider buying a new case?
    Last edited by davidmmac; 28-01-2009 at 09:06 PM. Reason: spelling

  7. #7
    Crossmember feersumendjinn's Avatar
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    Default Re: Computer making loud whirring sound

    If the rust was pre-existent, I wouldn't worry too much now if it's running OK (it may have caused corrosion on the motherboard slots/plugs/sockets etc, through condensation (being bare metal)).
    "...anyone who expects a source of power from the transformation
    of these atoms is talking moonshine..."
    - Ernest Rutherford (1871-1937)

    --------------------------

    Heck is a place for people who don't believe in gosh.

  8. #8
    amateur expert dugimodo's Avatar
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    Default Re: Computer making loud whirring sound

    the fan may be fine, a lot of computers get noisy in summer due to dust buildup in combination with the hotter days causing the system to crank up the fan speed to compensate. Cleaning the dust out will cool things down and allow the fan to slow down.

    It's not hard with practice to hear the difference between a loud fan and one with problems ( i.e. worn bearings / bush whatever )

  9. #9
    Member davidmmac's Avatar
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    Default Re: Computer making loud whirring sound

    You guys were right, the sound has come back.

    First it was last night, then this morning, now this afternoon.

    But the good news is I've diagnosed that it's coming from the back case fan, so I decided to look for a replacement, only, I have no idea what size to look for. All of the ones I've found are either 8 or 12 cm, but where is it measured from?

  10. #10
    Senior Member Blam's Avatar
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    Default Re: Computer making loud whirring sound

    You just measure the diameter.

    Get the Antec Tricool or one of the SycthX ones


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