Question about ASUS A7V266-C (A7V266-C W/A) Motherboard

1 Answer

Hi there. I have issue with this mobo regarded to pwrLED which is not ON even with the PSU plugged in. Actually what is happening is that as I turn ON the PSU main switch sometimes i get light from the LED and then it just shuts down again, and usually i dont get light at all when i powering the PSU. I already tried to change PSU and problem is still present. Also, i repacked the components into new case and before that action everything worked fine. But it worked fine in the new case too. I plugged PSU power cord in and out several times before i got this problem. Before that pwrLED was ON and i had issue with the pwr switch only as i was trying to plug it to the right pins. Few unplugging and plugging of the power cord to PSU in the new case and i got this :( Help pls

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  • dolke022 Sep 30, 2010

    I manage to fix the problem. It was short circuit because i mounted the mobo directly on the case metal and i believe because mobo is under the voltage it somehow interfered with the metal and disabled it to work properly. All is good now



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In my experience you may need to replace the case but if you feel up to the challenge you can clean the contact headers on the MOBO for the PW LED and try reseting the CMOS for the bios.

Posted on Mar 20, 2017


6 Suggested Answers

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: asus a8n sli deluxe not powering up

do you have 2 sticks of ram in the pc?

if so try it with one in and do this with both

as in boot it with a single ram stick and try to determine if its a faulty ram stick

also if you can try another power sup unit

please let me know how you get on

Posted on Mar 22, 2008

Chadha Saab
  • 142 Answers

SOURCE: asus a8v deluxe mobo no start

This is a NO POST scenario
How to troubleshoot No POST
1. Check wall socket whether power is working fine
2. Check PSU (Power Supply Unit) fan whether it is rotating or not.
3. Change power socket.
4. Change the the main power cable from the wall socket to the PSU.
5. Check whether the lights on the keyboard flash when you turn on the power.
6. Check the voltage selector swicth at the back of the PSU ( Ideally should be 115v for US region and 220v for Asia ).
7. Check all peripherals like keyboard, mouse, video cable whether they are connected properly or not.
8. Open Chassis >> Check RAM connected properly.
9. Remove add-on cards like graphic cards, modem card, PCMCIA card slots, LAN card etc.
10. Take out main power connector (grey-black) or brown, green cable from front board panel of cabinet from where you turn on the power for CPU. and also take it out from the motherboard,
11. Check I/O cable which comes from power button on cabinet whether it is firmly connected nor not.
12. Plugg all the cables back in.
If still u face the same problem Then
13. Take out CMOS battery from motherboard and press power on/off button for 30 seconds and plugg CMOS battery back in to the motherboard.
ram chips swapped out with a known working chip of the same type

HDD swapped over with the HDD out of my portable external backup HDD

A couple of items are really important if you decide to flash. First. Make sure the updated bios addresses the issue you are trying to solve. eg many motherboard makers update their bios's for many different reasons. A reason may simply be to get a certain big name brand of pc to work correctly with a new cd writer big brand pc is selling.
So you really have to read the docs so see if the upgrade addresses your specific niggle or concern. Secondly, try your motherboard maker first to see if they have the files you need. Bios's upgrades are best had, if available, from the company that made your motherboard or pc. In most cases these are free.
Thirdly, READ THE DOCS CAREFULLY AND FOLLOW THEM TO THE LETTER. Dont skip any steps, especially the backup option if available. Fourth, if the upgrade calls for a clean bootdisk, use one. The disk I made especially for bios flashing is the one you can download above. It's a DrDOS bootdisk with NO drivers loading up in config.sys or autoexec.bat which is very important. My bios flash bootdisk is recommended by the most popular motherboad makers.
If you dont have a 1.44 drive I also created a utility to use to flash from a CD which you can add the new bios and flash utility to and then burn it.
It should have room to add your new bios, the flash utility, and also have room for the backup. If not one can always use another disk for the info. Always use BRAND NEW MEDIA when dealing with flashes.
In order to locate the correct bios upgrade for your motherboard you need to know who made it AND you need to know the model number. If your PC was made locally perhaps you have the manual. If not, then you need to find out the maker and model. Or, and very common with major brands, your computer maker will/may have the updated bios's on their website.
I have one windows and three dos utils that find your motherboard maker and model number. One of them should work for you. The DOS utils are on my DOStools Page under Diagnostics, and are called CTbios, MBID, and HW iNFO. The windows utility is called BIOS Agent and is on my Utilities Page under Hardware .
Once you ID your motherboard and model go the the manufacturers website and see what they have available. Note that some upgrades will come with their own bootdisk/utility so you may not need the disk I made.
Again, note that even tho many people flash their bios regularly to get the latest features and never have a problem, I still recommend it as a last resort as a flash gone bad will make your pc unusable if the backup doesn't work. Look at it this way, suppose I have a used 80 gig drive I want to resuse and my old P400 cant even detect it so I have an unusable pc. This is the best, and most common reason to flash.
On the other hand, if you have a more modern pc that cant see lets say a 180 gig drive and but all else is working properly then you may want to consider a PCI hard drive controller card which has an onboard bios that will see your new large hard drive and also come with 2 more IDE channels you can use in addition to the 2 channels you already have. This is safer than flashing the bios.

Posted on Jun 08, 2008

  • 74 Answers

SOURCE: Motherboard shorted ? help please

Unless you have about a $3000 soldering machine and lots of skills soldering, i would say just get a new mobo. the cost to fix it would be lots more than its worth

Posted on Oct 11, 2008

  • 74 Answers

SOURCE: motherboard shorted

Unless you have about a $3000 soldering machine and lots of skills soldering, i would say just get a new mobo. the cost to fix it would be lots more than its worth

Posted on Oct 11, 2008

  • 10 Answers

SOURCE: front panel to motherboard, ASRock P4i65G, connections

the power switch is on the 3 and 4 pins....the 7 and 8 pin are the reset pins. Trying it on wrong pins just won't startup the board but won't short circuit anything.

Posted on Jul 29, 2009

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1 Answer

Msi 870-g45 failing to POST?

hi, i had a similar issue some time ago, dependng on your hardware i would suggest you look into a psu tester, or swap it out for a friend's psu, i assume you've ripped everything apart and put it back together to see if some dust was shorting somewhere, is it related to heat maybe, expansion of cracking can sometimes occur in computers that have gotten hot in the past, especially in the circuitry behind the cpu.

Good luck


Jun 04, 2012 | MSI 870G45 AM3 AMD 770 ATX AMD Motherboard

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I seem to have a problem with the power to my computer. After 2 days of searching all kinds of forums I still haven't found a solution. The computer won't power up, no fans are spinning, not a...

First remove the power plug from the smps and press the power switch few time and wait for few minutes the re plug the power connector to the smps and switch on the computer if you still dont have power then you will have to check whether the smps work to test that its not enough to test the voltage in the 21/24 pin you will have to short the green wire and the black wire and see whether the smps fan is working if the fan is not working then the problem is with smps

Jul 30, 2011 | ASUS Computers & Internet

1 Answer

While computer's working, fumes come out. PSU is replaced. However the floppy power connector is plugged onto system fan pins! on the mobo. That means ground-12V power-ground sense-ground ...

The PSU has some overload protection but not the Mobo power buss. If you were lucky, you only shorted the PSU 12/5 volt output to the Mobo ground which took out the PSU. BUT if the PC will not start-up the 12V power buss on the Mobo was probably damaged as a result of accidentally grounding it with the fan plug.

It's impossible to identify which logic has been damaged without a schematic, and even if you had one, you would need specialized tools and parts to repair the board. Sorry, but the days of repairing these kinds of components are long gone.

If you have any additional questions contact me by clicking on the "Add a comment" link located under your problem description on FixYa. Also, if you believe that this information was helpful to you, please rate my solution using FixYa's "Solution Helpful" rating scale.
Best regards,

Jun 25, 2011 | Foxconn M61PMV Motherboard

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Computer won't power up unless I jump pin 16 and 17 at the 24 pin connector at the motherboard. After I jump it, it runs till I shut it down. It will power up on a few more start ups but soon goes back to...

a real answer. not bs above.
you proved the PSU is ok, why go there?
the why this works is the chip called South bridge.
does all this (this is how (also) the windows start button and shut off works, called SOFT POWER OFF)
the button on the front panel is a N.O SPST switch.
normally open momentary and shorts a specific and non world standard pin on that mobo to ground, (adjacent pin)
this sends a logic zero state (0v) to the South bridge
then it turns on a transistor on that mobo and that grounds pin 16 to PSU, and PSU magcially turns on.,
end theory101....
the problem can be ; the switch is plugged in wrong. or bad.
HP uses vast numbers of MOBO in PCs so have all different pinouts. and hard super hard to trace and learn that.!
all mine are keyed, and the mobo is silk-screened painted, Front panel.
the other possible is that the PSU is not putting out standby power
on pin 9, with PSU plugged into the wall pin 9 must be at 5vdc.
if not the South Bridge will be dead.
as will the power switch it supports

The South bridge runs power. managment.
the 945P must have PSU standby power and the switch most reach its power on pin, or there will be no working switch ever.

The PC can also force the PSU off if one of the onboard
power regulators are reading wrong (say too high)
The power management is complex, but not that one pin,.below.

Power management,
wake on LAN, sleep, hibernate. and more.
but all we care is the power switch but if the above features work then the switch is bad, and why I mention that.

my PC can even self turn on at 6am if I want, (a bios features) self power on...

now the list of simple..tests,etc.
1: PSU pin 9 must be 5vdc at all times, wall plug aC connected.
and if read of PSU has a switch, set to logic 1 , (1/0 labled)
means on.
2: the correct working switch in front panel,
2b< that switch must be on the correct jack on the mobo and not off one pin or some other ERROR. there.
3:the PSU good ... some are not, (complex reasons) skip i will.
4: the MOBO most be good, (and not overheated)
will the PSU turn on if dvd/cd drive and HDD drive cables pulled.?
even pull RAM. sticks? it will beep like mad but will turn on.
and be dead but turns on. like that. well most do.
5: jump the pin below, does that turn on the PC? as it must!

A DT PC 12 years old now.

m7480n this PC is now retired at HP means zero support.
no service book but it lacked the power jack info in most cases

DATA: (first know what is there, the mobo is clearly labeled. look?
this is the best search I did for you,at HP real, yours
  • Manufacturer: Asus
  • Motherboard Name: P5LP-LE
  • HP/Compaq motherboard name: Emery-UL8E

ive owned many P5 in my life, not now but am an ASUS guy.

but this old board we can do research on it,
I like HP and HP likes ASUS as do I. both.
knowing this fact
we see
Asus Leonite P5LP-LE User Manual

then we find the book on it next like this, (took me 1second )
page 5 shows layout

bottom right shows, (F_panel) Bingo, on jack.

page 25 covers that jack
so pull the jack there pull plug from jack
then jump pin gnd /pwr pins with screw driver tip.
if PC turns on the switch was bad or plugged in wrong,
if not the PSU is dead, Standby power is dead, pin 9

p25-0kaf4dlf4nbtfyx5ejcudwbi-5-0.jpg Asus books always show all this, but never HP for some odd reason. (details like this)
good luck

Nov 07, 2017 | HP Pavilion m7480n (882780389410) PC...

1 Answer

I have a Compaq Presario SR1830NX desktop, I leave it on all the time, when I got up this morning, it was off, so I pressed the power button, but it doesn't power on, nothing happens.. I checked the power...

step 2 the TECH uses a voltmeter and checks all wires on PSU for correct voltage.

PSU in Desktop dead, my guess fans dead too right>
you never said, what it does inside PC ,except nothing
does nothing mean dead silence?
the fan must run for 1second, then goes off.
a 1 second run tells me the PC power switch told the MOBO to turn on and in turn it tells the PSU to turn on,
the PSU then turns on for at least 1second,and if the voltages are ok
then the PSU stays on, else off goes.

15 and 16?
the 20 pin older supplies those are both ground
but 24 pin ATX pins are correct there.
the voltages are here.

There are 2 causes, of dead power button.
1: the buttons 2 wire cable ends fell off. at button or PC mobo.
2: The PSU is bad.
3: the MOBO is bad.

The mobo can also shut off any PSU, if the PSU fails
or it sees the regulators in the MOBO fail.
the Desktop runs on many power rails.
some in the PSU, others on the MOBO.
THe mobo creates special low voltage for the CPU.

the power good pin, does that #8,
One way to see if the MOBO is overload
is to remove things from it, I start at RAM
lacking a voltmeter, this is very hard to fix any thing electric.
only guessing or pulling objects PC can find shorts.
pull all power cables there, hdd, power, cdrom.
all things that use red/yellow wires.
all SATA cables, all USB , then ram. even a fan can short
a good tech keeps an open mind, and finds why the PSU shut down.
in most cases, the PSU is bad. but not always.

This is a feature, of ATX it keeps you from blowing up say a
$300 microprocessor.... or fancy gaming Video card (have one)?
yes, pull the video card too.

Jun 25, 2017 | HP Compaq Presario SR1630NX PC Desktop

2 Answers

When I turn on the computer it starts to beep every four or five seconds; it doesn't even turn on the screen. The display at the motherboard is "04". What does it mean? There was nothing wrong with my...

This is do with a device failure it can be the RAM of your system , Try swapping the RAM and if you find two RAM in your system remove one to check the error.
Kindly send me your valuable feedback.

Jan 16, 2010 | Abit KV8 Pro Motherboard

1 Answer

Nothing happens when I press the power button (good PSU)

You've tested the PSU for volts, although you didn't mention the +12v, the critical thing with all PSU's though is Amps, if there is insufficient amps the CPU will not initiate properly, modern CPU's mobo north and south bridge chips Graphics chips etc are power hungry, volts are one thing amps are everything. Try and borrow a friends PSU to test, then buy a good one if it works with at least 14 amps on the +12v rail, the higher the better.

Jul 05, 2009 | Intel D915GAG Socket 775 Motherboard -...

1 Answer

PCV-W510G Power Supply Issue

Will Sony sell you another PSU?

It's a laptop I'll bet they require you to get authorization and return for service. Do so.

Best Regards


Jan 02, 2009 | Sony VAIO PCV-W510G PC Desktop

1 Answer


Doublecheck your powerswitch connection on the MoBo header. Also ensure that everything else on the header is seated correctly and tightly.

The case button may also be at fault.

You will then need to start methodical testing.

Sart with the PSU connected to a known good system. if that works you eliminate the PSU (You did turn tis on on the back didn't you! ;-)

If that Doesn't work try a known good PSU on this system.. If that works you for sure know it's the PSU that's dud.

If you have a spare Mobo try swapping the parts into that.

If it's a brand new board then it may be DOA, it does happen, but unlikely. Anthing else after the board actually gets power will mostlikely produce a beep code if nothing else.. Silence and not running is most likely one of the above.

If my solution was helpful please vote for me!

Nov 16, 2007 | Abit NF-M2S Motherboard

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