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There is humming sound coming from the computer and the green light below the power buttom is flashing.

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  • mrmpc Jul 08, 2008

    The computer is a dc 5100 and the green light I believe is the power indicator light

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Is the hum coming from the computer/case itself or the speakers? This seriously determines how you go about diagnosing the problem. If it's coming out of the speakers then it comes down to:
Checking for solid sound card connection (if separate) to motherboard
Checking for loose audio cables
Trying different speaker product
Trying out a set of headphones

The point is to try one thing at a time to see what might be the cause.

Now, if the sound is not coming out of your speakers then most likely it is an issue relating to something with moving parts. This all relates to hardware so it may or may not be something you are comfortable doing. Possible sources of the hum could include:
Hard drive(s)
Fan(s)
Loose screws (in the computer, not the owner)
Power supply

If the hum is present at all times then I would try the following:
First open the case and see if you can tell generally where the sound is coming from. If it sounds like the hard drive, turn the machine off, disconnect the power connection of your hard drive and see if the sound is present when you turn the machine back on. It won't boot but at least you can listen for the hum. If it's the hard drive then I would suggest you make sure the screws holding in the hard drive are tight. Ultimately, I would recommend replacing the hard drive. Most new drives include software for copying your old drive's data to the new drive. You may want to make a separate backup first, though.

For each fan, while the PC is running you can push on the center of the fan to momentarily slow down or stop the fan (be careful to not touch the fins as that might be a bit painful). If you notice a change in the hum volume then you have found your culprit. I have been told that sometimes you can oil a fan but that may depend on the fan.
Make sure all your case screws and electronic connections are tight. Make sure all cables are not touching anything with moving parts. When I got a new machine a few years ago, there was a terrible noise the first time I turned it on. It turned out the case fan cable was hitting the case fan blades. I fixed this with a small zip tie to the case.
If it seems like the power supply is the source you could always replace it and see what happens.
Hope that helps.......

Posted on Jul 08, 2008

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Ok this can be 3 things which you will have to determine one by one.
cd-rom is buzzing and broken. ( either cd is still inside or just broken)
2 hard drive is going bad and that will creat a buzzing sound too
3 or your cooling fan from either power pack or cooler fro cpu is dirty. Blow it out with vacuum. and clean it and it should take care of it. If really broken not hard to replace

Posted on Jul 08, 2008

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The green light is the hdd light that will flask. the humming sound should be a fan or hdd.

Posted on Jul 08, 2008

  • Legin Varghese
    Legin Varghese Jul 08, 2008

    for the you have to open the tower and disconnect the hdd/ fan and chk. remember there is also afan inside the power supply.

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You didn't list the make and model, what is this light for? Power light, cd drive, etc...

Posted on Jul 08, 2008

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