Question about HP ATX-300-12Z, ATX-300-12Z Rev. CDR, HP P/N: 5188-2625, Genuine Bestec 300W PS2 Replacement Power Supp... (ATX30012ZREVCDR) 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. i have the same problem ill try some of this advice

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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!).

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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  • diycomp Sep 05, 2010

    it took four times of unplugging/plugging the connector labeled p1 in my compaq presario sr1750nx to fixed this problem. thanks friend in spain from orlando, florida.

  • yaicu2 Jan 05, 2011

    Have an HP desktop that I got from a garage sale. The flashing light went away when I unplugged the power to the mother board. Works like a champ.

  • bani shora Nov 13, 2012

    Thanks spanishamigo - you nailed it!

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I have the same power supply here with the flashing green light. The computer is a Compaq desktop also. Disconnected the light turns on solid. I had added extra ram like you did. Replaced with a 500W power supply and computer works fine. I'd say that the problem is the power supply.

Posted on Apr 10, 2009

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Spanish Amigo you are my new best friend. Thank-you so much!

Posted on Oct 13, 2014

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The problem is the +5V Stand By cirquit in the power supply. It has bulged capacitor. It is very easy for a techically minded person to repair it. The reason it showed the problem after you installed new ram is because you unplugged the PS from the outlet and the bad capacitor loses a bit of his capacitance when it is not under voltage. The capacitor costs less than a dollar. It is 2200uF/6.3V as I remember. I have repared hundreds of those supplys with the same problem, this is my job.

Posted on Apr 18, 2014

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Did just like it said and it worked thanks

Posted on Jul 12, 2012

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From your description, I would guess you damaged the connections when you tried to install the RAM. When the connectors get short circuited, the power supply won't start.

Best advice, take it to a computer shop and have a professional examine it for damage. There is a chance it could be repaired. If unrepairable, time for a replacement motherboard.

Honest1abe

Posted on Jan 10, 2009

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SOURCE: Flashing Green Light on Power BESTEC Power Supply

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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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!

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