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Green led on the back of the tower flashes when plugged in but not getting power to on/off switch thus computer will not turn on.

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Sounds like the main psu has gone. Try unplugging from the mains comepletely for 5 mins, reconnect and try again. If it is "dead" or it powers up than immediately shuts down again.....it's your main internal power supply. If you are not affraid of electronics, you can buy them on ebay (just check the spec of the original first), if not, your nearest computer repair center should doi it for anything from around £50
Best Of Luck

Posted on Sep 03, 2010

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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 | Computers & Internet

2 Answers

Computer was shut down and power turned off. When i restarted the system the printer and monitor came on but the tower is not getting any power. cords are all plugged in and checked outlet works. seems...


Hello,

If the outlet is good and the cord is good, you may have indeed blown the fuse in the power supply. That is the only fuse. The fuse in the power supply is usually "hard-wired". Not necessarily, but usually. You would need someone familiar with them to replace it if it is blown.

Some computers have a green LED on the back of the computer near the power cord. Do you have one? Is it on? You can also look to see if the small green LED is on on the motherboard.

If you get no indication of power, the power supply is probably gone. A new on is about $25 and pretty simple to replace.

Hope this helps.

Thanks for using Fixya.

Feb 20, 2011 | HP Pavilion a705w PC Desktop

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

I plugged in my tower and i heard a loud high pitch beeping sound the green led light in the back was on but the power button turns green and the green led light in the back turned off there is no signal...


the green led light is it beside the network cable connector. if it is so, then it is always meant to be like that when you power up your computer. it is not something serious and it is normal.

Aug 18, 2010 | HP Pavilion 533w (P9859AR#ABA) PC Desktop

1 Answer

My Dell 8200 Desktop just stopped working. It turns on but doesn't boot; nothing appears on the screen. I was told this is the motherboard. Does that sound right?


two things
  1. What does the power LED on the tower indicate? Solid Amber? Flashing Amber? Solid Green?
  2. On the back of the Tower are 4 diagnostic LEDs, what do they indicate? Normally they flash thru several sequences and stop ABCD all Green. If the stop in another pattern, post the pattern.

Feb 13, 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

15 Answers

Green light blinking on back of my system unit but there is no power


I had this problem and i tried everything to make it work. Now all i do is put a hairdryer at the back whilst the computer is plugged in until the light stops flashing then switch on as normal. I also noticed that when the air is warm i do not have to use the hairdryer hopes this helps.

Aug 31, 2008 | Computers & Internet

2 Answers

Flashing Lights when powered down


The flashing LED is because your system is in "sleep" mode. By default windows Vista puts your computer in sleep. What this means is it doesn't shutdown the power completely it leaves a little going through certain computer components (more specifically the ram) to speed up the boot time when the power button is pressed again.

In XP a the default shutdown scheme is a complete shutdown where power is turned off after the shutdown process is done. If you are using XP you are putting your computer to sleep when shutting down.

As for the boot problem. Newer motherboards have an LED on the actual board to indicate that it is receiving power. If it is of either the power supply switch (at the back of the case) if off or the motherboard connection is loose and the shaking makes it fall into place. (Shaking is usually not necessary and indicates a problem...)

There are a few possibilities I can deduct from your description:
  • the connection from your power supply to your motherboard isn't properly seated and is causing this
  • the power supply switch (not the case switch) is being  turned off and results in the computer taking a few seconds before the internal LED become solid
  • ... the dreaded sign that the power supply is failing and is on it's last legs...
My suggestion is to check all connections and if that doesn't work borrow a power supply from a friend and swap them to see if it boots properly.

(If a friends with a spare power supply isn't an option a local PC repair shop should be able to help you out... but probably for a fee...)

Oct 28, 2007 | Computers & Internet

2 Answers

Dell P1110


Hi, The part where you see some color bars and blinking green led is what we call MONITOR SELF TEST. A diagnostic pattern consisting of four colors (red, green, blue and white) appears, and the LED flashes slowly. this happens when signal cable from the monitor is disconnected from the tower and leaving the power chord for the monitor plugged in. If the monitor works properly on a different computer. then its a problem with the computer's video card sending out signal. im 85% sure that its a problem with your video card.

Oct 02, 2007 | Dell UltraScan P1110 21" CRT Monitor

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