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The power will not come on and there is a flashing green light on the back of the tower

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When the computer is on the lights are on. A second later the lights are off and the computer is off. A second later the computer and lights are on. It keeps repeating that pattern.

Posted on Feb 20, 2009

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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

No power to computer, flashing green light by power cord


reset the surge protector first!

then investigate the power supply

Mar 27, 2012 | Compaq 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,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&tmp_task=solveCategory&lc=en&dlc=en&cc=us&site=null&lang=en&key=null&product=3245027#bph06788_section_2

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...

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

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

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