Loud Fan Won't Turn Off

Discussion in 'Computers and Stuff' started by Kiko, Apr 6, 2012.

  1. Kiko

    Kiko New Member

    Messages:
    175
    Location:
    Royal Oak, Michigan
    I have an HP Desktop 530J and am running Windows XP SP3.

    There are three cooling fans, and the loud one only used to go on for a few seconds or minutes when the room got hot or when I was using excessive CPU. Now the loud one goes on as soon as the computer boots up and NEVER goes off. It is really annoying.

    I took off the cover and vacuumed all the dust inside and I even took a couple of the fans apart to clean the insides, but the problem persists.

    Is there some kind of temp. sensor that could have burned out or is malfunctioning?
    Is there a software command I can use to turn the loud fan off?

    Edit: Now there is a new symptom. The computer spontaneously turns itself off with no warning. Is that what it does when it thinks it is overheating?

    TIA
    Last edited: Apr 6, 2012
  2. patrick88

    patrick88 Plumber

    Messages:
    836
    Location:
    Webster Ma.
    Might want to check the cpu fan and heatsink. It sounds like your cpu is over heating.
    If it keeps doing this. you will be replacing your cpu.
  3. Kiko

    Kiko New Member

    Messages:
    175
    Location:
    Royal Oak, Michigan
    It does seem like the rear of the processor is getting quite hot.
    I don't know what a heat sink is. Do you think the CPU fan has stopped working?
  4. patrick88

    patrick88 Plumber

    Messages:
    836
    Location:
    Webster Ma.
    Open the tower n to see if the fans are all on.
    The heatsink is the round or square thng that has a fan sitting on it. If it's full of dust your cpu will over heat. your mother board is telling you something is over heating. You need to solve this problem soon. If not your spending money. New cpu or new computer.
  5. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,049
    Location:
    NW Ontario, Canada
    Chances are it is a PWM fan and the high speed could be one of two things. Either the fan is out of control or there is a call for more cooling. If the pulse wire is open, the fan may run at full speed. I frequently replace those fans but usually because they stop turning.

    http://en.wikipedia.org/wiki/Fan_control

    You might be able to monitor temp and RPM with SpeedFan. I have used it with several laptops before.

    http://www.almico.com/speedfan.php

    You might also check for a BIOS update from HP. Also, check out HP's support forum.

    http://www8.hp.com/us/en/support-drivers.html
  6. Kiko

    Kiko New Member

    Messages:
    175
    Location:
    Royal Oak, Michigan
    Okay, I've had to borrow another tower to get back on line.

    It was the CPU fan that was running on high speed all the time, and after an hour, the computer would power down.
    The problem got much worse, once I took out the CPU fan and heat sink, cleaned them and put them back.
    Now it runs on high speed for only a few minutes before the computer powers down.

    The case is open when I'm testing this, so I don't know why the board should be overheating. Is there some kind of heat sensor that could be failing? Or is there something in the CPU board that is overheating, even though I don't detect any heat?
    Last edited: Apr 11, 2012
  7. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,358
    Location:
    Yakima WA
    I suggest you keep tinker with this until the CPU fries. Whatever you do, don't take it to a repair shop. They'd want to put test instrument on things and diagnose the problem.
  8. BobL43

    BobL43 DIY Senior Member

    Messages:
    1,793
    Location:
    Long Island, NY
    When you removed the heatsink and fan unit and cleaned them up, you ABSOLUTELY needed to (is that clear enough?), apply a heat transfer paste as per the instructions supplied with it. I have always used Arctic Silver when I build my Desktop PC's see: http://www.amazon.com/Arctic-Silver-Polysynthetic-Thermal-Compound/dp/B0002VFXFE The CPU and or its socket has a sensor to detect the overheating and shut the CPU down to protect it, so that part works. If you do not want to destroy your PC, then buy and apply this paste, and then get back to the fan issue. Is the noise just it running at high speed, or does it squeal and strain like it is constipated?:eek:
  9. patrick88

    patrick88 Plumber

    Messages:
    836
    Location:
    Webster Ma.
    i guess I should have said. Don't remove heat sink n fan.
    Thank you bob for pointing that out.
    At this point i would take back up computer n make it your prime pc.
    I have a laptop that a friend of mine gave me. It was over heating. I removed windows n it runs fine now. :)
    I am not saying do this
  10. Kiko

    Kiko New Member

    Messages:
    175
    Location:
    Royal Oak, Michigan
    Problem solved.

    I took out the fan and heatsink assembly one more time, and this time I noticed a small crack in the plastic heatsink mount, which caused the copper disc on the bottom of the heatsink to pull away from the CPU board. Apparently, it was still making small contact before I had removed the heatsink. But once I removed and reinstalled it, there was no contact, which is why it powered off so quickly.

    I bought an all metal replacement heatsink/fan, so this problem should not happen again.

    BTW, Gary, the repair shops wanted from $100 -$300 to diagnose the problem and much more for parts. I'm sure they would have also tried to sell me an unneeded CPU board as well.

    By "tinkering" with it myself, it only cost me $25, and I also gained a lot of knowledge.


    Thanks to all who responded.
    Last edited: Apr 21, 2012
  11. BobL43

    BobL43 DIY Senior Member

    Messages:
    1,793
    Location:
    Long Island, NY
    Good news and success is always good to hear. congrats! you did use the heat sink paste this time though, right?
  12. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,301
    Location:
    Houston, TX

    A lot of the new CPU Heatsinks do not use the Monkey Poo heat sink paste, they now have a Silicone Heatsink Pad.

    Not sure what is best, they both seem to work good.
  13. BobL43

    BobL43 DIY Senior Member

    Messages:
    1,793
    Location:
    Long Island, NY
    Last PC I built was over 3 years ago, and I haven't heard of the silicone pad thing. I'm going to look into that.

    OK, only thing I found was various types of paste and phase change compounds, but for silicone pad, I found this rather unrelated place, but it does have something to do with heat for sure. http://www.lovemybubbles.com/?ref=cj :eek:
  14. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,301
    Location:
    Houston, TX

    Wow, I like it...
  15. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,301
    Location:
    Houston, TX

    You know why they call it Silicon Rubber ?

    Because they have Silicon, and You need a Rubber.


    My Bad.
  16. Kiko

    Kiko New Member

    Messages:
    175
    Location:
    Royal Oak, Michigan

    Yes, but I think you are overstating the importance of the heat transfer paste.
    My computer was running for God knows how many weeks or months with a huge gap between the heat sink and CPU, and the only ramifications were that the fan ran on high speed and eventually the computer shut down.

    So, how could microscopic air gaps between the heat sink and CPU cause the CPU to fry, when it didn't fry when there was a 1/4" - 1/2" gap over an extended period?

    It seems to me that the worst thing that could happen is that the fan would run at a higher speed for a few seconds to pull off some miniscule amount of extra heat.
    Last edited: Apr 22, 2012
  17. BobL43

    BobL43 DIY Senior Member

    Messages:
    1,793
    Location:
    Long Island, NY
    WOT ME WORRY? Please don't ell ME the sky is falling!

    Hey, watteva works for you, GO FOR IT!
  18. Kiko

    Kiko New Member

    Messages:
    175
    Location:
    Royal Oak, Michigan
    I was hoping for a rational, scientific explanation to counter my argument.
  19. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,301
    Location:
    Houston, TX

    The CPU has internal Temperature limit control.

    It shuts down to protect itself from melt down.

    Most Newer Motherboards control the CPU fan speed, according to CPU temperature. And if the fan is three wire, it sends a tach pulse to determine the speed that it is turning, and knows if it is not running, or is running to slow. That will shut the system down if its speed is not correct.
  20. BobL43

    BobL43 DIY Senior Member

    Messages:
    1,793
    Location:
    Long Island, NY
    Well said Don, but kiko is implying his/her PC is running normally ohterwise, just noisy. Oops, just reread the first post, and it says that the PC is shutting down by itself spontaneously. Patrick gave kiko the first good advice, and I just added to it. If kiko prefers not to use the paste, its OK with me, as its not my PC I was trying to save from catastrophic failure. LOL. PC's are cheap these days anyway.
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