Sqealing Power Supply


I decided to clean out my CPU case. I've had it apart before to add and remove hardware. Anyway, I completely dis-assembled it. I took the motherboard out of the case, fans, the works.

I put everything back together and plugged the thing in. Without turning the machine on, and about a couple seconds of plugging the CPU in, the power supply makes a high pitched noise. I immediately unplug the CPU, the high pitch noise continues for a couple of seconds, making me think it's a capacitor.

Anyhow, I have unplugged all of the components except the power supply. So, it's just the power supply, nothing hooked up to it. The squeal still persists.

Anyway, this sound was not there before I took the computer apart. What did I do to mess it up? All I did was vacuum the case out.

Your insights are appreciated!
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  1. I think you need to be more precise in language to get good help.
    By CPU, do you mean Motherboard?
    The CPU is a chip that fits on a socket on the motherboard.
    Don’t ever plug in the PSU while you are working on the computer.
    The PSU should not turn on without motherboard connected. The on off switch is on the case and connected to the motherboard. If you could give a more accurate account of the situation you will get more help.
  2. It's a coil in your power supply that squeals, which exact power supply do you have?
  3. Hi all, when I said CPU, I meant the case. I wanted to clean it out.

    The machine is unplugged when I was working on it. I only plugged it in when I was finished.

    Power supply is stock in an old HP Pavilion 533w.

    It is a Delta Electronics DPS-200pb 139 A
  4. Also, there is an LED on the back of the power supply. Regardless of whether or not anything is connected to the motherboard, the LED turns on when plugged in and makes the noise.
  5. More details - I decided to plug it in and see if the noise went away after a few seconds. It did not. Additionally, the unit will not turn on via power button.

    I'm leaving it unplugged. At this point, I'm wondering - what did I damage? I have a hard time believing the power supply would fail at the same time I decided to take apart the tower.
  6. N39.99ewEgg http://www.newegg.com/Product/Product.aspx?Item=N82E16817371034
    39.99 less 15% with prom code: EMCNEJN33 and free shipping , about $34
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