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No post, only motherboard light on, green.

Cannot get power supply on. power switch is fine. unplugged everything 2 or 3 times. tried all power up procedures. the motherboard power light is green, steady. heard about this problem before, forgot the fix.

HP Pavilion 510n worked fine, then moved it. When I first turned it on the power button light came on and it seemed the fans were starting to spin, then nothing. I pulled the case and I can see the green light on the motherboard, but otherwise its dead

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You might try resetting the bios by removing the battery and the power cable. If there are pins to short do this too after removing the battery and the power cable.

Posted on Mar 01, 2008

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Acer veriton m460 won't turn on fan runs that's it

Power supply failure. Replace it. Get 50+ more watts than the original. Power supplies are inexpensive and can be replaced without affecting your operating system or programs.
BTW: Many "failed" power supplies still can deliver enough power to spin fans and turn on the lights.
I recommend:

If this helps please vote for my solution.

Jan 25, 2011 | Acer Veriton M460 Micro Tower Core 2 DUO...

3 Answers

No Power to my motherboard (PC won't start)

NO, the problem is the Power Supply.

Weak Voltage power rail.

Drag a multimeter out, and test the power of the 12 Volt power rail.

[The Yellow wires are 12 Volts. They all connect to one 12 Volt power rail inside the Power Supply.

Connect the Positive (Red) probe lead of the multimeter to any Yellow wire.
Connect the Negative (Black) lead to ANY Black wire.
ALL Black wires are Ground wires.

If you see 11 to 13 Volts the Power Supply is good.
If you see less than 11 Volts the Power Supply needs to be replaced.

An inexpensive multimeter good enough for this test can be purchased for $5 to $12.
A multitude of store carry them. An auto parts store is but one place.

Barring using a multimeter you can use a power supply tester.
Here is but one example,

An SMPS such as used in your HP Pavilion a6544f desktop computer, puts out three main Voltages.
(ALL are DC volts)

1) 3.3 Volts (Orange wires)
2) 5 Volts (Red wires)
3) 12 Volts (Yellow wires)

When you press the Power On button, it in turn presses against a Power On switch, located inside it.

(The Power On switch is a Momentary Contact Switch. Closes briefly, then opens up. It's spring loaded.

View this generic Power On switch. It's style is used in a multitude of computers,

{Granted the photo is small. You can enlarge it. Right-click on it, left-click on Save Image As, send it to your My Pictures folder. Then double-click on the file name, and in the window go to the bottom, and click on the Zoom In icon. The magnifying glass with the + sign in it}

The Power On switch case is composed of two parts.
An upper metal half, and a lower plastic half.

There is a convex shaped spring steel disk, in the lower half. The top half has a plastic post. It is this plastic post, that is pushed in by the plastic Power On button.

The plastic post pushes against the convex shaped spring steel disk, and flattens it out.

The spring steel disk outer edge makes a contact, with one of the wires leading out of the Power On switch.

The center below the convex shaped disk has another contact. This contact is connected to the other wire, coming out of the Power On switch.

When you press the Power On switch post down, it makes a contact with both wires.
When you release the Power On button, the convex shaped spring steel disk, pops back into it's normal convex shape.
All the things you never wanted to know, huh?)

Pressing the Power On switch closes a circuit for the Power Supply.
The Soft Power On.

5 Volts Standby power is always present in the Power Supply, when the Power Supply is plugged into power.
(This is what you bypassed. The Soft Power On)

The first chip on the motherboard to receive power is the BIOS chip.
{Chip and Chipset are slang terms for I.C.
Integrated Circuit}

The BIOS program is initialized.
Basic Input/Output program.

BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor on, and hands the computer over to the Operating System.
(Windows XP is one example of an O/S)

A) ALL the lights use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts.

C) A typical Processor can use 51 to 125 WATTS.
Depends on what Processor it is.

The Pavilion a6544f comes with an Intel Core2 Quad Q6600.
It can use up to 105 Watts of power.


(HP info about 95 Watts is erroneous)


Your Power Supply with the weak Voltage power rail has enough power to light lights, and spin Fans with the 24-pin ATX main power cable unplugged.

Continued in an additional Comment.

Jun 13, 2010 | Computers & Internet

1 Answer

HP a1050y no power I tried all suggestions posted, and everything

Try Unpluging the power supply and press and hold the power button for about ten secs - leave it off for about two min and plug it back in and turn the computer on.

see if that work,


Mar 31, 2010 | HP Pavilion A1050y (PU131AV) PC Desktop

2 Answers

Blingking light on my motherboard, no power.

Chances are your power supply and computer is fine! From other forums on this problem (which I also had), I've learned the following:
1. If you unplug the computer for a half hour or so (the blinking green light will gradually slow down and quit) and plug it back in, the situation will correct itself and the green light will be steady; however if this does not work,
2. a reset that works for a lot of people with the blinking light problem involves leaving the power supply plugged in and unplugging the power supply connection at the motherboard (it usually also has a blinking green LED) and plugging it back in. To read up on how to do this, Google "blinking green light on computer power supply" and read through some of the forums and you'll come on more specific instructions. Usually, you have to wade through everybody telling you to replace the power supply or your motherboard is fried. It's worth a try for a quick fix, just in case those situations don't apply!

May 30, 2009 | Sony VAIO VGC-RB42G PC Desktop

2 Answers

No post, only motherboard light on, green.

Hey there aj1253, It seems you are getting power to the board. are the fans running?Are you using onboard video or video card. Onboard is suggested for test. I would also suggest you reseat your ram. That is removing it and ensuring it seats properly. Beyond that I would ask you provide more info ( ie is this a new build, or did it just stop working, configuration details, model #'s, et....)

Feb 01, 2008 | Dell Dimension 2400 PC Desktop

34 Answers

Power Green Light Flashing HP Desk Top PC m7250n

During a power outage their is a surge when power come back on the grid (surge can be caused by lighting strikes akso). This surge trips the internal procters inside the power supply to protect the Mother Board, hard drive, processor and fans and any device that pulls wattage from the power supply. Since all these power using devices are trying to pull power at the same time to boot the computer back up one ends up with a loop of surge thrugh the power supply with a protective trip, reset, surge again and trip again. This will continue in this loop as the computer is trying to boot all the devices at one time (Mobo, Hd, processor, cooling fans and other devices). Simoly, more power wattage is being demanded than the protectors will allow at one time causing a protective shutdown followed by a restart followe by a protective shutdown in a continious loop.
The normall sequence for a boot is to boot the board, processor and fans followed by a boot of the hard drive, and other boot devices once the board is energised, NOT all devices at the same time, as this results in an overload and trips the protectors. This protective loop is indicated by the blinking light as the power is turned on and then shut down for protection as the wattage pull is over the demand that the protectors will allow.
Blinking light indictes you are in the protective loop.
SOLUTION: 1. Disconnect the Mother Board connector, with the computer unplugged, this will allow the power supply to reset at maximum wattage upon reboot.
2. Disconnect the Hard Drive power connector and ay boot device power supply cables, this will allow the Mother Board, processors and fans to boot without an overload of the protector inside the power supply.
3. Plug in the computer and the indicator light will be solid green indicating that it is reset and out of the loop.
4. With the computer pluged in and the Power Supply fully energised, plug in the Mother Board. The computer will now boot, and the processor fan will come on and the cooling fans.
5. After computer has rebooted, shut the computer back down and connect the Hard Drive power cable and any other power cablis that were unplugged.
6. Reboot with all cables connected and you are up and running again.


Hope this helps everone with power outages and lightining strikes. It is a rather common problem and can also occure when building a computer and one missmatches the power supply with the board wattage needs. If the board wattage needs are greater than the power supply output you will get stuck in a potective loop eventually. WHEN BUILDING A COMPUTER ALWAYS MAKE SURE THE POWER SUPPLY CAN PRODUCE MORE WATTAGE THAN YOU CAN CONSUME AT THE MAXAMUM LOAD.
Have a great computing experiense.

Jan 13, 2008 | HP Media Center m7250n (ED842AA) PC...

2 Answers

No power, power supply & motherboard green light blinking

I had the same exact problem for the same exact reason. Plug the power cable into the back. Open up the side of the case and unplug all the wires that the power supply plugs into. The motherboard, harddrive, cd & dvd drives, everything. wait about 10 minutes and plug them back in, plugging the BIG cable that connects to the motherboard back in LAST. This will make the light go from blinking to solid. I think it is a safety? to protect the motherboard from damage.

Nov 01, 2007 | Sony VAIO VGC-RB42G PC Desktop

9 Answers

Psu blinking green light, no power

I read all the solutions, followed the manufacturers instructions exactly, replaced the cmos battery and nothing solved the problem (blinking light on PSU after a power failure and no startup at all). I had ascertained that the PSU was intact by disconnecting all the PSU connections to drives and motherboard at which time the PSU LED stopped blinking and was constantly on.
Just before throwing my computer away I decided to follow the instructions listed by "guest" to unplug the power to the motherboard and then with the power supply back on to plug the cables back into the motherboard. No only did sparks not fly, but it started up and ran perfectly! Many thanks to "guest."

Oct 31, 2007 | HP Compaq Presario SR1230NX (PJ518AA) PC...

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