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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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


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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Posted on Jan 02, 2017

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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

  • 146 Answers

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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1 Answer

Why is my hp pavilion a1220n product number ED904AA-ABA?

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.

Dec 12, 2012 | HP Pavilion a1220n (A1220NED904AA) PC...

1 Answer

My monitor no display and light is blinking

if the monitor light is blinking this suggests that, there is no display signal coming from the tower. This could be because of the following .

1. Bad video card 2. Bad video software

To check,where the problem is , power of the system tower and remove the power cord from the back of the tower. Press and hold the power buttoon for 10 seconds and the reconnect the power cord and turn the tower on. Check if there is any display or the status of the light changes from amber to green for even a small instance.

If the light changes to green and back to amber the video port on the tower is bad

Alternatively you can connect the monitor to another desktop or laptop to check if the same is working correctly.

Thanks for using fixya

Oct 13, 2012 | Computers & Internet

1 Answer

The tower wont turn on at all, there is a flashing green light that is on in the back of the tower itself. what could be wrong with it?

If it is unable to boot at all, I mean nothing at all such as fan/ lights from the front panel, then your powersupply bad, and needs replacement.

Jan 24, 2011 | Computers & Internet

1 Answer

My problem is that there was a recent blackout and when the power came back on my computer did not turn back on the back of the desktop is displaying a flashing green light instead of solid green. Any...

Bad Power Supply. Weak voltage power rail.

The Green LED flashing on the back is now a diagnostic light, and is conveying the above.

Allow me to show you using HP as an example,

Click on the + sign to the left of .

Power supply light is on or flashes

What is the computer manufacturer name, and Model Number?
(Back of the desktop computer tower next to the Windows product key, or up on the side of the computer tower)

Post in a Comment

Dec 08, 2010 | Computers & Internet

1 Answer

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

Feb 05, 2010 | Dell Dimension 4600 PC Desktop

1 Answer

Wont post led 3 flashes

if its the red flashing light on the tower, its the hard drive activity light.

when the monitor goes on stand by, does the tower retain power? (green light on and flashing red light sometimes?) Does your keyboard's scroll lock/num lock/caps lock keys and keyboard lights work?

Sep 07, 2009 | AOpen AX4SPB-UN (91.8AT10.013) Motherboard

1 Answer

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.

Mar 27, 2009 | Compaq Presario S6500NX (DQ181A#ABA) PC...

1 Answer

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.

Sep 16, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

2 Answers

Green light blinking screen blank

Hi Suzee,

Is the green flashing on the tower or the monitor?

If it is flashing on the monitor, then it might be tht the monitor is not gettign signal from the tower.
To check, disconnect the monitor from the tower and check the monitor. If you get a msg on the screen like no input signal or check video cable, then 99% monitor is fine.

Check for the power supply light at the back of the tower.

Disconnect everything from the computer and then press and hold the power button on the comp for about 30 seconds.

Then connect the cables and check if it is working.

Jan 14, 2008 | Sony SDM-S73/B Monitor

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