Question about Bestec (ATX-250-12E) 250-Watt Power Supply

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Flashing Green Light on Power BESTEC Power Supply

I have a Compaq desktop machine that I recently added 1GB of RAM. Now, the machine will not turn on and the power supply light on the back of the CPU flashes green. If I pull the ATX connector from the motherboard, the supply stays solid green. Is the motherboard fried? I tried removing the RAM, reseating the RAM & blowing out all of the dust from the PC, motherboard, fans, & power supply.

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  • gsk_sv Jun 23, 2008

    Hi, Lee -



    Are you saying that the motherboard is toast or the power supply is toast? I'm planning on buying a 350W powersupply tomorrow just to see if I can get the beast running again...



    THANKS!

    -gk

  • gsk_sv Jun 23, 2008

    Update:

    Replaced the 250W power supply with a 450W Thermaltec this morning. Works like a champ.



  • nagusm Aug 31, 2008

    The kids went to turn the computer on yesterday and nothing happened. The power supply led on the back was flashing. So I unplugged everything and replugged it in. Nothing happened. I am thinking the power supply is the problem and will change that. Likely go with a larger one now, maybe a 300 watt.

  • jts1012 Nov 12, 2008

    I also have a flashing green light. if I unplug the mb plug the light remains steady. If I plug it in the light starts to flash

  • EIB11C Jan 05, 2009

    I have same problem, my power went out for a couple of hours. When I tried to turn the pc back on the light flashes on the back. I tried to unplug the motherboard and the light turns steady gree. I plug the motherboard back in and it flashes again. Any suggestions short of get a new computer? HP a230n about 3 years old with no prior problems.

  • OneDream
    OneDream Feb 22, 2009

    "while the power was connected to the computer, I pulled the main powerplug to the motherboard. After doing this the green light was notblinking anymore and was solid green. While power was still applied tothe computer, I reconnected the power plug to the mother board and thelight stayed solid green. The computer now started up properly. :)"

    That did it, you're a life saver. :D

  • raukowen Feb 24, 2009

    Same problem, near as I can tell. My father, who knows a bit more about computer insides than I do, thinks it's the power supply, but compaq/hp's own troubleshooting suggests that the motherboard is the problem, the power supply is PROBABLY ok. I like the plugging the motherboard in while power is applied, but I'm as always afraid of frying something and doing more damage.

  • Kaustav Lahiri Apr 16, 2009

    i have a 3 year old amd athlon 64 3000+ with 256mb ddr400 ram and geforce 6200 le agp8x 256mb. recently i re assembled my pc and cleaned it after there were similar power problems.but now problem is increased 2 folds! my system now takes 4-5 hrs to just power up the mother board.also after it has powered up my graphics card is like hell.with loads of vertical lines and system crashing as soon as i run any 3d app.there was no prior prob to this.i dont know wat happened to my graphics card due to the power supply.i cant even check it in other machines as all my friends now have pci-e!

    my power supply is 400W ColorsIT brand.

    I havent tried the last post mentioned here.hope it works!!

  • Anonymous May 25, 2009

    The same problem and the same solution. Why is it happening? I don't understand.

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This is an easy fix so here you go nice and simple:

Problem: Your motherboard circuit has been cut.

Causes: Power disconnected during operation. Power outage or short in the surge protector.

Symptoms: Flashing green light on both motherboard and power supply. System will not power on.

Solution:

Step 1: Ensure that both the power supply and the motherboard lights are flashing green, not solid or off.
Step 2: While the power is on, disconnect the power supply from the motherboard. This connection is the largest of the connections and should be listed as the 'P1' or 'Primary' power connection.

Step 3: Wait until the green light on the motherboard stops flashing and check to ensure that the green light on the power supply is now solid. If it is not solid, disconnect the power to the power supply and wait until the light turns off completely. Then reconnect, it should be solid now.

Step 4: While the power is on, reconnect the P1 connection to the motherboard and you should now see that the light on the motherboard is solid.

Step 5: Power on your PC. The problem should not persist.

Warnings: If the power supply light remains flashing after you have restored power to it while it is disconnected from the motherboard, it may be a system failure in the power supply itself requiring replacement. Always be careful when working with an active or live power machine.

I hope this helped! Good luck!

Posted on Mar 01, 2009

  • taricp35 Feb 10, 2011

    I have two Compaq desktop's that has been sitting in the corner for almost 2 years. I was about to buy new MOBO's because I just knew that was the problem and I came across this thread. The green PSU light was blinking, I removed the PSU connector from the MOBO , then plugged it back in and the light on the PSU stayed solid green, I then pushed the on button and just as you guys said, the PC came on. Now here is my issue, if I click the on/off button nothing happens the PC stays on and the two fans (One over the CPU, and one at the back of the PC) keeps running. This seems odd to me. Any ideas what may be the problem? Thanks in advance for the help.

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I've an hp pavilion that wouldn't power up (with the little green LED flashing in the back) after a 2 hr. power failure, and so I called hp support who told me to find a working computer and go online and talk to a technician. I guess my Indian isn't that good...

But I figured my power supply was shot, despite having good surge protection, so I took the desktop to the repair shop who told me it was in fact shot. All the power supplies he had for salr had a output of about 500 watts (my original was 250 watts) so I bought one for 30 bucks with an output of 580 watts, but it was supposed to have a "Low noise dual fan" and paid 25 bucks for him to install it.

After I got it home, the first thing I noticed was the noise it made. Loud! But at least I had power and then I did a little Internet research on this flashing LED thing and found this site as well as a couple others that said to disconnect the power to the motherboard with the power on. It sounded scary, but I was mad at having a new power supply using over twice the power and making 3 times the noise! So I CAREFULLY pulled the new one out (after grounding myself of any static and taking notes on what goes where) and reinstalled the old one myself and tried some of the solutions I read online. Holding the power button in for 10 seconds with the power cord disconnected did nothing but disconnecting / reconnecting the power strip to the motherboard with the power on worked! It stopped the green LED on the power supply from flashing anyway. (The motherboard has no LED on my computer but disconnecting the power strip for a full minute worked.)

I then pulled the power cord and reconnected all my perpetuals and plugged it back in and got the darned flashing green LED again. So I simply pulled the power strip from the motherboard for a minute again, and got the LED steady, and powered up and found everything working just fine.

So I'm thinking that every time I lose power, I'll have to do the power strip/motherboard thing, but at least my computer is quiet again. Now I just gotta get that kid at the repair shop to take his Pure Black noisy 580 watt power hog back. Wish me luck, and thanks Mechlire for the solution. Your advise beats the heck out of what all these paid professionals have to offer...

Posted on May 03, 2009

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Thanks for the trick ,, unplug -plug the motherboard worked, BUT..

NOW, every time I turn the power off , I have to go thru the same rituals to get it going. Any solution...

Posted on Dec 10, 2009

  • my_sub May 31, 2010

    Pulling the Main power supply to the Motherboard worked, BUT everytime I turn the PC off I had to go thru the same routine and was very annoying. I replaced the Powersupply and ALL IS WELL...

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Thank you Mechlire. my brother (nickwht) was talking to me over the phone of what you said, and it worked perfectly!!! the power at my house went out (because of the wind) and after i got home my mom went to turn her computer on and nothing was happening, nothing worked at all, except she noticed a green light flashing in the back like a strobe light just under the AC in-put. now all i did was make sure everything is plugged in, then, like you said Mechlire, i unplugged the main power supply unit(PSU) from the motherborad with the AC still plugged in, then it was solid green and then plugged the PSU back in to the motherboard, the light is still solid green, then i pressed the power button, and the computer lives again!!!!! THANKS again Mechlire. to prevent this, like i did with my computer, make sure to unplug the AC when the power go's out so you don't get power serge's. cause next time you might not be so lucky :D

Posted on Jun 05, 2009

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It worked!!!!!!! this revived my old athlon!! although i don't remember how many times i tried b4 it worked. may be i wasn't following it correctly. this pc was almost condemned and i was using another one. and that one failed too. and it was then that i saw this solution. THANKYOU VERY MUCH.

Posted on Mar 14, 2009

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That is very likely as a 250 Watt power supply is usually not sufficient now a days.
Thanks,
lee

Posted on Jun 23, 2008

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Thanks for saving this day. Unplugging P1 (primary power) from the mother board (computer unplugged from wall outlet) and connecting P1 with the computer plugged into the wall outlet worked great for me!

Posted on May 31, 2010

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Hi,
Same problem with the flashing green light on psu, tried to do the unplug and plug in motherboard main power with no success. Luckily found spare psu I had from older machine that I had retired...swapped this with psu in problem computer and all was fixed...was psu issue for me.

Posted on Jul 11, 2010

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Thank you mechlire that was awsome it worked my mom almost lost her pc and you saved it thank you sir.

Posted on Jun 05, 2009

I had the same exact problem. Moved computer to another location and the power supply was blinking green and the computer would not turn on. After reading somep posts online, while the power was connected to the computer, I pulled the main power plug to the motherboard. After doing this the green light was not blinking anymore and was solid green. While power was still applied to the computer, I reconnected the power plug to the mother board and the light stayed solid green. The computer now started up properly. :)
Hope this helps!

Posted on Aug 05, 2008

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Man, lots of solutions for this one. Just for anyone not having any luck with them....My psu was flashing green & pc wouldn't start up. It ended up being a RAM problem. One of the modules was not seated properly (pressed down all the way). So simple, I wanted to smack myself after all the other things I did first!

Posted on Jul 18, 2010

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This sounds very weird but I swear it worked for me...

1. Unplug everything from the computer.
2. Make sure to leave the power cord plugged into the wall and computer.
3.Using a hairdryer,blow heat on the flashing green light for two to three minutes. The flashing green light should turn to a steady green.
4. Turn on computer. Good luck & i hope this works for you! Let me know if this works!

Posted on May 31, 2012

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Pulling P 1 (power plug on motherboard) trick works-- however, power supplies can have problems that are not simply resolved by "removing load" from the power supply and then pushing the start button, and this is what you are doing with this trick. According to the HP compaq website, the power supply should be upgraded if you add power consuming devices ( or replace smaller power users with larger power using devices) or even add peripheral devices like external ext hard-drives or usb devices like printers majik jack phone etc . If the original power supply can't handle the original configuration the PC came with, WITHOUT additional power users attached to the PC ( whether they were internal or external additions ) then it is reasonable to suspect that a failure of the power supply --- the pulling the wire trick and then replacing it is simply UNLOADING the power supply momentarily and then after you shutdown the PC and try to restart it the PC once again is needing MORE POWER than the original power supply can give it at start up. This is either (1) a Failed or damaged power supply or (2) a PC component that is ailing and wants too much power thereby stopping the PC from starting up just like a bad battery connection or a corroded connector prevents an electric motor from turning over from a stopped position because it can't get enough (it may be getting a reduced voltage or a reduce current (amps) but it is Not enough to start up) - either way it is a POWER issue , so installing a New power supply is a good attempt at fixing the problem. Remembering that MFRs are in business to make a profit, one should Not assume the power supply they installed inYour PC was a double duty unit that has twice the power you may ever try to use-- it was probably chosen as "Adequate" for the application because the next larger size power supply COSTS MORE! Upgrade the power supply.

Posted on Mar 31, 2010

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I had the same exact problem. Moved computer to another location and the power supply was blinking green and the computer would not turn on. After reading somep posts online, while the power was connected to the computer, I pulled the main power plug to the motherboard. After doing this the green light was not blinking anymore and was solid green. While power was still applied to the computer, I reconnected the power plug to the mother board and the light stayed solid green. The computer now started up properly. NOW, every time I turn the power off , I have to go thru the same rituals to get it going. Any solution...

Posted on Jan 04, 2010

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I disconnected & reconnected the motherboard as indicated above. This solved the blinking green light problem perfectly. Thanks! HOWEVER, when I tried to power on the computer, the light on the PSU went out all together then, so.... what would that indicate? Thanks!

Posted on Jul 05, 2009

Pulled the main power to the motherboard and the light went solid green. Plugged it back in and the problem is fixed... Thanks posters... *wink*

Posted on Oct 12, 2008

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SOURCE: Flashing Green Light on Power BESTEC Power Supply

Hi. NO, *********** board is not fried. I am not sure what the problem is but I do know how to fix it. It is usually casued by power outages (even if you have UPS supply).

1. TAKE OUT THE ELECTRICITY LEAD TO THE COMPUTER. Look inside the computer and find the bunch of wires coming from the power supply unit (the box thing at the top with the fan and all those colouted wires!).

2. Find where these wires run into a plastic connector and plug into the mother board. Unplug it.

3. Now plug the electicity lead back into the computer. The light should now stay ON.

4. Plug in the connector again... and boot up. Leave it run a while to convince it!

5. Repeat this process if it does not work first time.

This should fix your problem . It works for me when I get this problem.

Friend in Spain

Posted on May 09, 2009

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Hi. NO, *********** board is not fried. I am not sure what the problem is but I do know how to fix it. It is usually casued by power outages (even if you have UPS supply).

1. TAKE OUT THE ELECTRICITY LEAD TO THE COMPUTER. Look inside the computer and find the bunch of wires coming from the power supply unit (the box thing at the top with the fan and all those colouted wires!).

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Friend in Spain

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