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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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Compaq sr2013wm


1/ do you have an ethenet cable plugged in ? is this light located on this plug ? unplug the cable first
2/ check that the monitor is switching ON
3/ find a power switch at the back of the case and switch off and/or unplug the power cable, for at least 10 sec
4/ switch on/connect power cable, and turn computer ON
5/ if nothing happens, then power supply may be dead ; don't worry it's inexpensive and super-easy to change ! but first check the manual (or manufacturer) for the meaning of the GREEN LIGHT ! Then open the case and CHECK if the computer is perfectly CLEAN, or DIRTY ; especially double check the RAM modules ! Clean everything with air spray and soft brush (pull out processor, ram, cards, if you find lot of dirt)
6/ after cleaning try to turn on computer again ; if fails, go to buy a new cheap power supply that fits your motherboard, or try to find someone that can lend you one for testing

good luck

Apr 13, 2014 | Computers & Internet

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,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5250576&CatId=5471

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)

http://en.wikipedia.org/wiki/Switched-mode_power_supply

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,

http://www.directron.com/atxswitch.html

{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.

Sources:
1) http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01494006&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=3757419

(HP info about 95 Watts is erroneous)

2) http://en.wikipedia.org/wiki/List_of_Intel_Core_2_microprocessors#.22Kentsfield.22_.2865_nm.29

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,

Thanks

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

1 Answer

Emachine T2890 won't power up. New power supply.


move its bios jumpur on cofig mod and after some time post it its orignal post .it will ok ok Insha Allah

Feb 19, 2009 | Intel D845GVSR Motherboard

16 Answers

Flashing Green Light on Power BESTEC Power Supply


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!

Jun 23, 2008 | Bestec (ATX-250-12E) 250-Watt Power Supply

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

1 Answer

Wont post.


Try a few things for me OK? From what you typed, turned on the psu "the toggle switch on the psu", pc seemed to be starting up. I need you to keep the toggle switch on the power supply in the on position. Press and hold the start button on the PC case to shut it down. Give it a few seconds & power up by pressing the power switch on the case. Notice a differance? Next, unplug everything connected to the pc expect the monitor, mouse & keyboard. Try to boot. Still no? Remove the side of the case exposing the board. Turn the psu off by flipping the toggle switch on the psu, wait till the green light on the board goes out. Grab the Mb ( I know it's tight in there) and see if you can move the board in any direction. Not loose? Re-check all data & power connections for a solid connect. Re-check your case to Mb connections. Also check the PSU, there is a red slide switch it should be set to 115v. Post your findings..
map

Jan 28, 2008 | ASUS P5ND2-SLI Deluxe Motherboard

1 Answer

Power LED on but no boot up


it could be your power switch, veriy that it isnt the power supply by

1.) un-plug it from the main board
2.) look at the main board connector(one coming of the power supply)
3.) you should see green wire and next to it a black one
4.) using a paper clip bridge the too wires
5.) if it works proceed to net step if not get a new power supply

to check case switch and board switch

1.) plug in power supply to main board
2.) look at the pins where the power button connects to
3.) using a metal object (blade screw driver) bridge the pins

if the board should start up>
then its your power button on the case that is bad, you can try to repair it, chage it or buy a new case,

if it doesnt work.
1.) ensure that jcms(jumper to flash the bios) is set correctly
2.) unjack each drive one at a time to see if any is causing stalling
3.) get a new main board

Jan 02, 2008 | EliteGroup L7VMM2 Motherboard

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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