Question about Compaq Motherboards

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Doesnt switch on

When switching on ,no light,computer wont start,power light is lit,also makes buzzing sound

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  • gjohn47 Sep 29, 2008

    thanks for reply
    it is not beeps,but a buzzing sound

  • gjohn47 Sep 29, 2008

    hi trytodoit
    took pc to repair shop,it was dust in black box in back of power supply,fixed ,new black box fitted
    many thanks for trying to help


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  • 76 Answers

You said buzzing sound is this more like a beep? Beeping sound are indicative of any number of diagnosable issues, depending on the actual number of beeps and the type of motherboard.

Posted on Sep 28, 2008

  • J. May Sep 29, 2008

    It is hard to say what is going on. I have heard cooling fans buzz when they are going out. If the computer is not working I would look toward the power supply possibly having gone out. I am not sure if you are comfortable in replacing it, but if you had an extra one (or could borrow one) than I would suggest that you change it out to test. You can hook up the bare minimum components (motherboard, hard drive, case fan) to the test power supply just to check the system out without actually installing the power supply. I have actually placed two computers side by side and hooked one power supply up to the other computer to test, without actually installing any parts.

    Also, there are power supply testers on the market where you just plug them into the power supply, but I have never used one so I am not sure about these. You could simply use a multimeter to do the same thing.

    I did some additional research and there are reports that on Compaq laptops the AC adapter can go out and making a buzzing sound. I am not sure if this applies to your situation.


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Im having a problem with some sort of power issue, sometimes it works and sometimes it just doesnt come on. i can hear a buzzing noise but it doesnt spin can you help thanks

I think I had this kind of issue before on my computer. I sorted it out. First I check the motherboard and wiring inside if there are any wires touching the fans because of the buzzing sound. Found nothing. I noticed that the buzzing sound came from my hard drive. It seems that it's not getting enough power that's why its struggling to spin. What I did was I changed my power supply to higher wattage and everything was fine after that. You can give it a try though. If it still the same issue, you might as well try a different hard drive.


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certain thing happen in a given order during the boot process. the bios loads so the start up starts it loads to the ram and bring the hard drive up then video. your unit is stopping in the very beginning of these steps. follow these steps to isolate the cause.

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I installed the mainboard and I'm not getting the computer to come on. I get a green power light, but when I push the power button, I get nothing.

your not activating the power switch, double check the user manual and be recheck the pwr pin on the header, some are horizontal some are vertical.

if that still doesnt help use a phillips head screw driver and short the two pins you think they are, if they are the pins you were using you have a bad power switch (try using the reset switch as a power switch) if those dont start it try a differant pair until you find the power pins.

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I have the same problem with my dell inspiron 1520 laptop

You have an obvious electrical problem. It could be that the switch on the power module is faulty.

Remove the hinge cover and depress the power switch on the power module. If the system is starting without hinderance then the issue is the tab under the hinge cover is not making proper connection with the switch below. If the same problems persist when you go directly to the power module then the module has a faulty switch. Radio shack has those tact switches for $3.58. You can either replace the switch or replace the module.

Good Luck

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My computer runs for 2 seconds then shuts down.

First off all download the manual
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1 Answer

Power LED on but no boot up

it could be your power switch, veriy that it isnt the power supply by

1.) un-plug it from the main board
2.) look at the main board connector(one coming of the power supply)
3.) you should see green wire and next to it a black one
4.) using a paper clip bridge the too wires
5.) if it works proceed to net step if not get a new power supply

to check case switch and board switch

1.) plug in power supply to main board
2.) look at the pins where the power button connects to
3.) using a metal object (blade screw driver) bridge the pins

if the board should start up>
then its your power button on the case that is bad, you can try to repair it, chage it or buy a new case,

if it doesnt work.
1.) ensure that jcms(jumper to flash the bios) is set correctly
2.) unjack each drive one at a time to see if any is causing stalling
3.) get a new main board

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Its the Mother Board..I had the same problem and had to have a new MB put in

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