Question about HP Pavilion a815n (PS512AA) PC Desktop

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Tower will not turn on .

Also the green light on the back of the tower is flashing.

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Re: 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.

Posted on Nov 22, 2007

Re: Tower will not turn on .

If you have a dail up modem pull it out and then try to start the pc again.

Posted on Nov 22, 2007

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SOURCE: orange flashing light on tower

There are a few lights on most towers one will mean that you are powering on your computer the other flashing orange as you say most likely is the hard drive activity light and is usually nothing to worry about. If there is some kind of problem you are having with computer light please feel free to repost and we will be glad to help you.
Thank you and if this helps answer your question that says (orange flashing light on tower) Please leave feedback or rating. Thank you have a nice day.

Posted on Feb 01, 2010

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The power supply generates 3 different voltages for the system. The most common cause of the symptom you are describing is a loss of the 5V supply line. This is an internal failure of the power supply that sometimes can be easily fixed, but the cost of repair is likelt to be higher than a replacement supply. A typical power supply will cost around $40. If you have another system around, swap the power supplies between the two. If the system now appears to work, you have confirmed the problem.


Posted on May 10, 2010

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SOURCE: Tower won't turn on. There is a green light on the

Pull the power cord out and allow it to reset. If you still have issues you may need to replace your power supply.

Posted on Aug 05, 2010

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Try removing the 512 MB memory to see if it does work with the 1GB stick only.

It's not the power supply that does have a problem. It has something with your memory stick.

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Sounds like the power supply is bad. That's the one inside the tower.

You could try blowing dust out of it,  reseating the connectors. But I have a feeling it needs replacing.

Go here for detailed instructions from HP..


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Screen will not come on hard drive light no light checked power supply is ok

Things to check:
  1. Power led on the front of the tower, it should be solid green when on. Flashing Amber is generally an indication of a bad power supply inside the tower
  2. Power LED Solid AMBER indicates system is not finishing the power on self test (POST) and you remove all connections from the tower except power and try turning on again. If no change, remove all PCI and PCI-E cards from system, try again, no change replace motherboard.
  3. On the back of the tower are 4 diagnostic LEDs near the ps2 ports marked ABCD, after the POST, during a normal boot the will flash in several sequences and with boot is finished all 4 should be green. If they stop an a different pattern, then that indicates a failure Yellow Yellow Green Green indicate bad RAM for example
  4. If the LEDs on front and back are Green then the system appears to be booting but the monitor display is not functional

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Flashing Green light on back and tower won't come on.

Yes, you should try replacing the power supply first. If that doesn't work, then it could be a bad motherboard.

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No video

Try to check the light on the monitor. If it is amber, then check the video cable both from the back of the monitor and the tower. Try a known-good monitor. Check the diagnostic LEDS of the tower. There are four of them in the front panel. When the computer starts normally, the lights flash. After the computer starts, all four lights display solid green. If the computer malfunctions, the color and sequence of the lights identify the problem. If you have a solid green light on the tower, no beeps heard and no video, check the LEDS. If you get 2-4 light, a possible graphics card failure has occurred. If the computer has an external graphics card, open the tower, remove the card and put it back in. If still persist, try a known-good card. If it still does not resolve the problem, try reseating the memory cards. Remove and put it back in. If still no go. Then it's a motherboard problem.

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2 Answers

My pc light flashes green

need to know the model # and type of computer? Remove all external devices except mouse, keyboard and monitor. If not getting any power at all, could be your power supply.

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