Question about Compaq (176763001) 120-Watt Power Supply

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450 power supply

I'm hearing a clicking sound from my power supply and my computer does not boot up. I have noticed that the red light is blinking on my cpu and the cd rom drive's green light is also blinking. If i open the cd rom the computer boots up, but when i inserted a cd and close the cd rom the clicking sound will be heard from the power supply and the system shuts off. pls help.

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The cd may be bad, or if the power supply is just marginal, it may be failing when the cd motor spins up.

Posted on Jun 08, 2008

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I have dell optiplex 360 but LED ligth remain on does not turn green when i powerd on.no signal , beep sound and display


Believe it or not it is probably your Power Supply. Just because it lights makes the system lights up does not mean it is working properly. Sometimes it has enough power to make the light glow, but not enough power to make the fan in the power supply start or any other functions.

You can also try the things below to see if they work, if not replace the power supply.

When you plug in the power cord is there any lightswhatsoever on the computer?

When you press the power button do you hear fans running, hard drive spinning,lights on the computer, hear any beeps or lights constantly blinking, hear theDvD/CD drive click and the light on the drawer of the DvD/CD turn on for asecond or two? If so the computer is trying to boot or may have booted, butthe screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous. Most times the problem is with the Memory or Video Card when you hear beep tones or blinking lights. Notice the pattern of the lights and blinks. Do you get 1 Long Blink or Beep? Maybe you get 1 Long followed by 2 Short Blinks or Beeps.

Maybe your power cord is bad if you don't get anything to happen whatsoeverwhen you press the power button.

Maybe you have a Static Charge Buildup. Remove the Power Cord, Remove theBattery, then Press and Hold the power button for 30seconds. After 30 seconds plug the power cord back in (leave the batteryout) and hit the power button to see if it boots. If it does, you can putthe battery back in and let it charge.Memory Chip might be bad.
Remove the Power Cord, Open the Case and remove one of thememory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x onit with an ink pen. If it fails to boot then move the chip to the nextmemory slot and try rebooting. If it fails take the chip out and set itaside, then put the other chip in and try booting it in both slots. If itboots, just to verify that the chip set aside is bad, mark an x on it and putit into the open memory chip slot and try booting.

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No beep sound,orange ligth remian on does not go off dell optiplex 360


Believe it or not it is probably your Power Supply. Just because it lights makes the system lights up does not mean it is working properly. Sometimes it has enough power to make the light glow, but not enough power to make the fan in the power supply start or any other functions.

You can also try the things below to see if they work, if not replace the power supply.

When you plug in the power cord is there any lightswhatsoever on the computer?

When you press the power button do you hear fans running, hard drive spinning,lights on the computer, hear any beeps or lights constantly blinking, hear theDvD/CD drive click and the light on the drawer of the DvD/CD turn on for asecond or two? If so the computer is trying to boot or may have booted, butthe screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issue when you hear beeps or blinking lights continuous. Most times the problem is with the Memory or Video Card when you hear beep tones or blinking lights. Notice the pattern of the lights and blinks. Do you get 1 Long Blink or Beep? Maybe you get 1 Long followed by 2 Short Blinks or Beeps.

Maybe your power cord is bad if you don't get anything to happen whatsoever when you press the power button.

Maybe you have a Static Charge Buildup. Remove the Power Cord, then Press and Hold the power button for 30seconds. After 30 seconds plug the power cord back in and hit the power button to see if it boots.

Memory Chip might be bad.
Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

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No Display, so does it seem like the computer booted up and is running except that the Display is black? Do you hear fans running, disk drive spinning, blinking lights or beeps?

I'm going to assume that in your case since you mentioned a red light that it is not booting up all the way. Therefore your problem is probably with the memory, the video card or some other motherboard issue.

Remove the Power Cord, Remove the Battery, Remove the cover that houses the memory on the bottom of the laptop then remove one of thememory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x onit with an ink pen. If it fails to boot then move the chip to the nextmemory slot and try rebooting. If it fails take the chip out and set itaside, then put the other chip in and try booting it in both slots. If itboots, just to verify that the chip set aside is bad, mark an x on it and putit into the open memory chip slot and try booting.

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How many blinks? Count and notice the patterns of the blinks (3 long blinks or 1 long blink followed by two short blinks).

Remove the Power Cord, Open the Case and remove one of thememory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x onit with an ink pen. If it fails to boot then move the chip to the nextmemory slot and try rebooting. If it fails take the chip out and set itaside, then put the other chip in and try booting it in both slots. If itboots, just to verify that the chip set aside is bad, mark an x on it and putit into the open memory chip slot and try booting.If all the above fails, you problem could be your Video Card or a motherboard issue.

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Remove Power Cord then press and hold the power button for 30 seconds, then put the cord back in and try to start it.

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If you press the power button and absolutely nothing is happening then you most likely have a bad power supply.

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