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PSU Green Light Blinking

March 4, 2008 at 11:40:12
Specs: XP Home, 2.13 Ghz AMD/512MB RAM

The PSU light keeps blinking green when everything is connected properly and the computer wont turn on when I push the power button. I found a way to get around it by leaving the power cord connected and unplugging the P1 connector from the motherboard, now the PSU light is just static green. Then I plug the P1 connector back with the power cord still connected and the computer turns on. Once I unplug the power cord and hold down the power button and then plug the power cord back and press the power button it doesn't turn on and the PSU light starts to blink again. I think it's the motherboards P1 connection. Any help?

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#1
March 4, 2008 at 12:09:30

Messing around with anything on the MBoard while the computer is plugged in is asking for trouble. If you haven't already damaged something you eventually will.

Give some details of how and when this started.


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#2
March 4, 2008 at 12:31:18

Well I mean I know that. I was carefully unplugging them making sure that I was only touching that plastic on the connector. I am fixing it for someone, they said they tried a new power supply and that didn't fix it. They also said that there was a power outtage. I am pretty sure it is the motherboard though. Once I get it on it can stay on for however long I want it too. But once I unplug that power cord and plug it back it wont work, until I leave the power cord on and disconnect and then connect the P1 connector.

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#3
March 4, 2008 at 12:55:11

I agree with everything Othehill said.

ATX mboards are always powered in some places as long as live AC is being supplied to the PS (and the PS is switched on if it has a switch), regardless of whether the computer is running. You must remove the AC power to the PS whenever you install or remove any connection or component that plugs into the mboard or the PS connectors inside the case, otherwise you may damage something.


Your post is confusing.
PSU is power supply unit.
Your computer case is not a PSU, or a CPU, it's just a computer case.
Most computer power supplies have no led on them.
Are you talking about the led on the front of the case, or the one that may be on the mboard itself?

P1 connector? Do you mean the 20 or 24 "pin" main connector from the PS, or another one with fewer "pins" from the PS?

If you have not recently changed any connections inside your case, or changed any components such as rqam inside your case, and your symptoms appeared out of the blue, and the computer was working fine previously, the most likely thing is your power supply is failing.
They often partially work yet your computer will not fully boot.
Failing power supplies are common and can cause your symptoms.
Check your PS.
See response 4 in this:
http://www.computing.net/hardware/w...

If you HAVE recently changed any connections inside your case, or changed any components inside your case, and it's only since then you had these symptoms, or if the computer has never worked, we need to know what you did or what went on before you got these symptoms.

E.g.
- installing ram that is incompatible with your mboard chipset can cause it to not boot fully.
- installing a cpu (processer) the mboard bios version doesn't recognize can cause it to not boot fully.



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Related Solutions

#4
March 4, 2008 at 13:10:07

By P1 connector I mean the 20 pin main connector from the PSU. This power supply that is from Compaq has a LED on it and when the computer doesn't turn on the green LED blinks. Check this link out http://h10025.www1.hp.com/ewfrf/wc/...

The only time I can get the computer on and running perfectly is when the power cord is plugged in, then I remove the 20 Pin P1 connector from the MOBO and then plug it back in. Then the light on the PSU stays green, not blinking anymore. I press the power button on the front and the computer turns on.


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#5
March 4, 2008 at 13:18:30

" I am fixing it for someone, they said they tried a new power supply and that didn't fix it. They also said that there was a power outtage."

Is your original post and response 2 about the original PS or the new one?
Are the specs in your first post for that computer or your own computer?
If they are not for the other person's computer, we need to know the correct specs.
Failing power supplies rarely damage the ram, and the other ram may not be compatible with the mboard's chipset.

Power outages can easily damage computer power supplies, and/or the mboard or anything connected to it, especially if a power surge or spike was produced, especially if the computer was not plugged into something that protects it from surges and spikes, although a lightning strike on the power grid somewhere close enough can damage the PS even if it is plugged into such a device.

When a power supply fails, whether it damages something else while failing is random, but if the PS is an el-cheapo brand and model, it is a lot more likely to damage something else such as the mboard when failing - what is the brand and model of the original power supply?

If someone has installed ram that wasn't in the mboard when it worked, remove it and install the original ram.



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#6
March 4, 2008 at 13:29:15

Okay the power supply in it now is the one that has always been in it. The one they bought didn't fix the problem so they returned it and put back the original which is in their now. The specs are for this computer I am talking about in this forum. Its a Compaq Presario SR1030NX product number DW256A-ABA. But once again I can get the computer on and running for however long I want. Just noticed there is a strange smell when I turn the computer on coming from the PSU.

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#7
March 4, 2008 at 14:18:16

"Just noticed there is a strange smell when I turn the computer on coming from the PSU."

That's a common symptom of a damaged PS.
See response 4 in this:
http://www.computing.net/hardware/w...

You haven't explained which led you are talking about, or provided a better description of what the hxxx this P1 connector is.


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#8
March 4, 2008 at 14:30:28

Tubes

The OP is disconnecting the main power connector to the MBoard and reconnecting it while the PSU is on and connected to the mains.


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#9
March 4, 2008 at 15:02:11

"Tubes
The OP is disconnecting the main power connector to the MBoard and reconnecting it while the PSU is on and connected to the mains."

I noticed that. He may have already damaged something as you say.

giss32

"Compaq Presario SR1030NX product number DW256A-ABA"

Parts for that model:
http://partsurfer.hp.com/cgi-bin/sp...

"Power supply - 5187-1098 250-watt, regulated (Zinfandel)"

I searched using: Zinfandel 5187-1098
According to this and many other "hits" it is made by Bestec:
http://www.circotech.com/bestec-atx...

Bestec PS models are notorious for being a lot more likely to damage other components when they become defective or fail, usually the motherboard.
Emachines computers commonly use them, and they are probably the most frequent reason for emachines computers failing to boot, even after replacing the PS.

Assuming the computer owner tried a new PS that has at least a 250 watt capacity, if it didn't restore the computer to a working state, it is very likely the mboard was damaged when the Bestec PS failed or became defective from the power outage.

Usually when a PS kills a mboard, the ram, cpu, and the hard and CD and floppy drive are fine.

This is the mboard in this model:

"DW236-69001 Motherboard (system board) - Kelut, GL6E
5187-4913 New part for DW236-69001"

There are often used mboards available on the web for brand name system computers for a reasonable price, say , $100 or less. You could search with DW236-69001 or 5187-4913 or the Presario SR1030NX model number.
BUT make sure the seller states the mboard has been tested and is working - it may have been damaged by a Bestec PS too!!

The advantage of getting the same mboard, other than you can use the same ram and cpu for sure, is it has a Compaq bios version on it that goes along with the mboard model and the original Compaq software installation. If the computer owner ever needs to load the original software from scratch from Recovery CDS, the software will probably refuse to load if it isn't the same mboard, and/or unless it has a Compaq bios version on it, and the Windows software on a brand name system often cannot be used or will not install unless the system has the right mboard model.



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#10
March 4, 2008 at 15:19:02

Only thing I want to know is why does it still work when I disconnect and reconnect the P1 20 pin connector from the MOBO and if there's any way to fix it so I don't have to disconnect and then reconnect the 20 pin power connector.

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#11
March 4, 2008 at 15:27:18

I don't think you are going to get an answer to that question, giss32.

My guess is a weird motherboard problem. It would seem to be either a power supply or motherboard problem. But you could disconnect everything from the motherboard to be sure.


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#12
March 4, 2008 at 15:31:46

Yeah I did that, I'm pretty sure that it's the MOBO but I don't want to buy one if it's not the problem, well thank you everyone.

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#13
March 4, 2008 at 15:32:49

Defective PSU. The one they tried may have be incompatible or undersized.

Check the case power switch to MBoard wiring. Remove the two wires from the MBoard. Have the computer powered up. Take a flat bladed screwdriver and temporarily shoort those two pins. If the computer then starts up there is something wrong with the wiring or switch. If there is a reset switch on the case, disconnect that temporarily too. Your problem is either a defective MBoard, problem in the wiring/ switches or bad PSU. Look at the MBoard for bulging or leaking capacitors.


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#14
March 4, 2008 at 15:51:00

Thanks I'll try that.

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#15
March 5, 2008 at 09:37:00

I'm just buying another MOBO and PSU.

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#16
March 7, 2008 at 10:31:16

It was the power supply that whole time.

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#17
March 17, 2008 at 11:47:06

I had the same problem,,,Had to un-plug the mother board same as you... Replace your power supply and your problems are over...I assume this happened after 2 to 3 power hits during a storm.....


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#18
May 5, 2008 at 14:28:41

You idiots spend more time putting each other down and picking on each other's choices of words to ever offer any real solutions. Offer a damn solution some time rather than trying to ACT smart by answering with even more questions. Nerds.

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