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Light flashing on back of power supply. - HP Compaq Presario SR1053WM PC Desktop

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  • Dwayne Dennis
    Dwayne Dennis May 11, 2010

    Thats called a beep code its letting you know that something has gone bad in your system, could be the onboard video card, the ethernet card or the modem youll have to google beep codes from the maker of your computer and find out what that codes is and replace what ever it is that went bad

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Verify the fuses inside the PC

Posted on Aug 29, 2009

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I cannot turn on the HP Pavillion1450. Green power light flashing at rear.


The power indicator light on the back of the Power Supply flashing when power cable plugged in, indicates a problem with the power supply. There is a short somewhere in the wiring. It will need to be replaced.

Apr 11, 2011 | HP PC Desktops

1 Answer

Green light is flashing in back of computer but it will not turn on


if the green light you're mentioning came from the power supply, you need to replace it. green light flashes from the LED at the back of the power supple serves as an indicator if you have a good or a faulty power supply.

Aug 07, 2010 | Compaq Presario 5000 PC Desktop

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Hp Pavilion a1120n will not power up.


Yes it needs a power supply. You can get a cheep one on eaby or get one off of the HP site

Hope this works,

Luke Wilcox

Dec 28, 2009 | HP Pavilion a1120n (PX759AA) PC Desktop

2 Answers

I have an HP Pavilion a384x. It will not turn on


First with the computer turned off make sure the switch on the power supply is set to 115v.

If you turn the computer back on and you still get a flashing green light on the back of the power supply and a constant light on the front of the computer with no video, then try replacing the power supply with either a new one or a known working good one.

If that doesn't do it then it has to be the motherboard at that point.

Keep in mind normally on those power supplies, the green light should be constant. So it has to be either the power supply is bad or the moterboard is bad and you'll know when you put a new or known good working power supply in the computer.



Aug 03, 2009 | HP PC Desktops

1 Answer

Green light flashing on back of unit near power cord also green light flashing on motherboard near power supply plug in.


I would suggest trying to replace the power supply. If that does not fix the issue, i would need to hear more about the computer.

May 06, 2009 | Sony VAIO VGC-RB40 PC Desktop

1 Answer

Orange Power light flashing


Most likely a power supply failure. It apears that the power supply is not putting out all necessary voltages.

Replace the power supply

Sep 02, 2008 | Gateway 556GE Intel Pentium 4 630 3GHz(HT)...

2 Answers

Power Green Light Flashing HP Desk Top PC m7250n


The 'cure' for this is to replace the power supply.
Inside your power supply are Electrolytic Capacitors. These are Filters for a power supply. To simplify detailing the construction of them, let's just say they are small aluminum 'cans', with an Electrolytic paste inside.

They are used to filter the incoming AC electricity from your house, (Business, school, whatever) They are also used to filter the DC electricity, coming out of the power supply. (Your computer power supply converts AC electricity, into DC electricity)

The one's we're going to concern ourselves with here, are the Output capacitors. The one's that filter raw DC into true DC.

When a capacitor (Of this type) starts failing, it's because Electrolytic paste is developing a gas inside. (Hydrogen gas) The gas expands, breaks a seal, and begins pushing the paste out. (Oozing out)
So much paste loss, and the capacitor can still function, but at a weakened state.

These capacitors deal with the voltage power rail for a power supply. Weak capacitor? Weak voltage rail!

Your processor requires a steady, 'clean', supply of DC voltage. It operates in a very TIGHT tolerance. Too much, or too little, it turns off. Too little it doesn't turn on.

The power surge has weakened Electrolytic Capacitors inside your power supply.
Lights light up. Fans spin. It sounds like the harddrive is running. (It IS! It's just sitting there spinning. More about that to come)

ALL the lights use less than 1 watt. EACH fan uses 2 to 3 Watts. The harddrive just sitting there spinning, uses about 5 Watts.

When it's time for the processor to turn on, (BIOS turns it on), it can't! Processors use 55 Watts to 125 Watts. Depends on the processor make and model.

Your harddrive just is just sitting there spinning, because the processor isn't running.

Solution? Replace the power supply, be happy.

Apr 02, 2008 | HP Media Center m1080n (PC099A#ABA) PC...

3 Answers

Power light flashing


not understanding your question ..need more info .. is the computer not booting ? Is it flashing red, green, orange? need more info

Mar 08, 2008 | PC Desktops

34 Answers

Power Green Light Flashing HP Desk Top PC m7250n


During a power outage their is a surge when power come back on the grid (surge can be caused by lighting strikes akso). This surge trips the internal procters inside the power supply to protect the Mother Board, hard drive, processor and fans and any device that pulls wattage from the power supply. Since all these power using devices are trying to pull power at the same time to boot the computer back up one ends up with a loop of surge thrugh the power supply with a protective trip, reset, surge again and trip again. This will continue in this loop as the computer is trying to boot all the devices at one time (Mobo, Hd, processor, cooling fans and other devices). Simoly, more power wattage is being demanded than the protectors will allow at one time causing a protective shutdown followed by a restart followe by a protective shutdown in a continious loop.
The normall sequence for a boot is to boot the board, processor and fans followed by a boot of the hard drive, and other boot devices once the board is energised, NOT all devices at the same time, as this results in an overload and trips the protectors. This protective loop is indicated by the blinking light as the power is turned on and then shut down for protection as the wattage pull is over the demand that the protectors will allow.
Blinking light indictes you are in the protective loop.
SOLUTION: 1. Disconnect the Mother Board connector, with the computer unplugged, this will allow the power supply to reset at maximum wattage upon reboot.
2. Disconnect the Hard Drive power connector and ay boot device power supply cables, this will allow the Mother Board, processors and fans to boot without an overload of the protector inside the power supply.
3. Plug in the computer and the indicator light will be solid green indicating that it is reset and out of the loop.
4. With the computer pluged in and the Power Supply fully energised, plug in the Mother Board. The computer will now boot, and the processor fan will come on and the cooling fans.
5. After computer has rebooted, shut the computer back down and connect the Hard Drive power cable and any other power cablis that were unplugged.
6. Reboot with all cables connected and you are up and running again.

POWER SUPPLIES HAVE AN INDICATOR LIGHT FOR A REASON.
REMBER - BLINKING LIGHT IS AN OVERLOAD OF THE PROTECTORS AND ELLIMINATING THE OVERLOAD SOLVES THE PROBLEM AND THAT THE POWER SUPPLY IS WORKING AND CONVERTING POWER.
NO LIGHT MEANS NO POWER OUTPUT AND THAT INDICATES THE POWER SUPPLY IS NOT FUNCTIONING AND NEEDS REPLACED.

Hope this helps everone with power outages and lightining strikes. It is a rather common problem and can also occure when building a computer and one missmatches the power supply with the board wattage needs. If the board wattage needs are greater than the power supply output you will get stuck in a potective loop eventually. WHEN BUILDING A COMPUTER ALWAYS MAKE SURE THE POWER SUPPLY CAN PRODUCE MORE WATTAGE THAN YOU CAN CONSUME AT THE MAXAMUM LOAD.
Have a great computing experiense.

Jan 13, 2008 | HP Media Center m7250n (ED842AA) PC...

2 Answers

PC totally locked


The flashing power switch and power supply LED on the rear in conjunction with a power failure or surge indicates that there is a defective component; typically the power supply, motherboard, memory, processor or modem. -Disconnect all the power supply leads, drives, and motherboard as well as any USB, firewire and other external devices. -Plug in the 115v power supply cable and look at he LED on the back of the power supply. If it is still flashing the power supply is bad and needs to be replaced. -If it isn?t flashing then unplug the power supply plug in one device, plug in the power cord and watch for the flashing LED again. If it?s flashing you?ve found your culprit, if not move on to the next component and repeat the process until you?ve found it. Don?t forget your plug in cards could also be the problem. Good luck and let us know if you have any other questions. As always please don?t forget to rate this posting.

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