Question about HP Pavilion a450n PC Desktop

1 Answer

No response from desk top computer when trying to turn it on.

Green light on the power supply keeps flashing, when I disconnect everything from the power supply the light stays on. I then started to connect things back together one at a time with the power off each time and the light will stay on until I connect the motherboard, then the light starts to flash again. I believe that the motherboard is probably damaged but could there still be something else going on. Did not have this problem until we lost the power the one day.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 145 Answers

I think your SMPS has gone bad. Get it checked from a qualified person

Posted on Dec 19, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Flashing green led light in back of tower


hi, okay you got to be careful here, it's sounds like the power supply has called it a day, disconnect from the mains take the side panel off and get sniffling can you smell a burn smell , no , now pull the power leads from the hard disk and DVD drive if fitted now removing anything that could cause a short on the board , turn it on, do you get video display ?


Please be careful of static shock and mains shock so only look inside once it disconnected from the mains.
Keep me updated please.


Regards

Dec 21, 2012 | PC Desktops

1 Answer

My desk top will not turn on the green light at the back is on does not flash, if i try to turn on the pc the light in front will flashe yellow but the desktop will not turn on


Replace the power supply.
Apparently you are getting power to that, but it is not passing power to the motherboard.
If this does not work, I would suggest the following for troubleshooting:
Open the case and unplug everything but the memory (hard drive, CD, other cards)
Now try to start it. If it starts, it's probably the CD.
If, with only the CPU and memory plugged in, nothing happens, then it's probably the power supply.
The next step would be to replace the motherboard.

Aug 24, 2009 | Gateway 507GR PC Desktop

1 Answer

Hp pavilion 513n tries to start up then turns off


This is a case where something that is getting switched on during start-up is causing the power supply to fail... probably due to a short. How ever I believe the short is in the power supply

This is an older HP model ( I have a 530N) with teh same problem. I bought a new power supply and installed it.

Aug 14, 2009 | PC Desktops

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

On my desk-top presario


HP/Compaq has had alot of power supply issues with this series of computers. Do you have another power supply you can try in this system? If the light is flashing rapidly, it is usually a power supply. Fairly cheap and easy to replace.

Jan 26, 2009 | Compaq Presario SR1050NX (DW257A) PC...

2 Answers

Hard drive fan stop working computer stop, yes I have power but but,computer will not tyrn on PC will not power up when I woke up this morning and went to use it the green light on the front was flashing...


Power supply light on or flashes Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure: CAUTION: This product contains components that are easily damaged by ElectroStatic Discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap that is connected to a grounded surface, like the metal frame of a PC.
  1. Disconnect everything from the computer, including the power cord.
  2. With the power cord disconnected , press the power button on the front of the computer for five seconds. Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps. NOTE: If the power supply fan makes an inconsistent grinding sound or stops and starts erratically, replace the power supply
  3. With the power cord removed, flip the red voltage selector switch to the opposite position. Wait about five seconds, and then switch the red voltage selector switch back to its original location. Ensure that the voltage selector switch is on the correct setting, 115V for North America. Performing this step ensures that the voltage switch is engaged and set correctly for your country/region. Figure 4: Voltage selector switch c00517964.jpg Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
  4. Plug a lamp into the same outlet to see if the wall outlet has power. Try the computer in a different outlet in order to eliminate the outlet as a possible source of the issue. Test both to see if the wall outlets have power.
  5. Remove all extension cords, power strips, surge protectors and any converters that remove ground. Plug the power cable directly to the wall outlet. Test for power. If this fixes the issue, find the device that is causing the issue and do not use it. NOTE: If you find the device that was causing the problem was a surge protector, resetting a breaker or fuse on the surge protector may fix the issue.
  6. Remove all attached devices except for keyboard, mouse, and monitor.
  7. Remove any internal component that was recently added, such as video card, memory, CD, DVD, and hard drives. An added device may take more power than the power supply is rated for. If the problem goes away when the component is removed, the only option is to upgrade the power supply to power supply with a higher wattage rating.
  8. Check the power switch:
    1. With the power cord disconnected, press the power button on the front of the PC. The button should release easily and not stick in the socket.
      • If the button sticks, it should be replaced or serviced.
      • If the power button does not stick and appears to be functioning, continue using these steps.
    2. With the power cord disconnected, remove the case or side panel.
    3. Follow the wires from the power button on the front of the computer to their connection on the motherboard.
    4. Look at the power switch cables connected to the motherboard. If the cable has become disconnected, connect the power switch cable connector to the connector on the motherboard. Figure 5: Power switch connector on Motherboard c00517968.jpg
    5. Replace the side panel, plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.

Oct 24, 2008 | Compaq Presario 5000 PC Desktop

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

Tower will not turn on .


My first guess is to replace the power supply. These are fairly cheap and easy to replace. Unplug your computer. Just open the side of the computer (often the left facing you). The power supply is on the top which is plugged in. Remove the plug and locate 2 - 4 screws that hold it in place. Disconnect the main from the motherboard (remember where this goes for later). Install the new one and reconnect power. This is the most likely reason. If that fails, the motherboard may be dead. The green light flashing indicates that the internet is ready but has no power.

Nov 22, 2007 | HP Pavilion a815n (PS512AA) PC Desktop

10 Answers

Computer will not power on


Regarding the blinking green light on power supply for hp a430n...I've had that happen as well when the computer is turned off for an extended period of time. It would not immediatly power up when plugged in to power. Hitting it and beating on the button didn't help either.

However, after calming down, I noticed that when I unplugged the computer that the light continues to blink, but gradually fades and goes out. So, I thought that since power supply holds a charge after being disconnected as can other components inside a computer that I would assume the converse: It needs to power up to "full charge" as well. In my case, I was right.

All I did was plug the computer in and leave it alone for about 20 to 30 minutes, go sit and cuss for a while. When I came back and checked it after that time, the front panel blue light was on and the green light on the power supply was glowing steady. The computer started right up! Thank goodness...stopped cussing.

If it hadn't, and I had tried all the resets listed above, I would have bought a new power supply too...but not this time!

Oct 21, 2007 | HP Pavilion a420n PC Desktop

Not finding what you are looking for?
HP Pavilion a450n PC Desktop Logo

311 people viewed this question

Ask a Question

Usually answered in minutes!

Top HP PC Desktops Experts

Fred Sops

Level 2 Expert

271 Answers

john smith

Level 2 Expert

366 Answers

Gavindu Dileepa

Level 1 Expert

10 Answers

Are you a HP PC Desktop Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...