Question about HP Pavilion a705w PC Desktop

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The computer turns off after about five seconds without POST

When the computer is turned on the computer turns off after about 5 seconds. when the cable coming out of the psu that has the two yellow and 2 black wires coming out of it, is not connected it works fine. but once that connector is placed back in the mother board it will not work.

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  • Art Ellison
    Art Ellison May 11, 2010

    What does that cable go to?

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  • 170 Answers

Change your power supply. Thats the most likely and cheapest solution. Need more help? Let me know. Good Luck!

Posted on Jan 21, 2009

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Posted on Jan 02, 2017

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1 Answer

How do i turn on a compaq ps-7231 power supply?


Pin Name Color
Description 1 3.3V Orange +3.3 VDC 2 3.3V Orange +3.3 VDC 3 COM Black Ground 4 5V Red +5 VDC 5 COM Black Ground 6 5V Red +5 VDC 7 COM Black Ground 8 PWR_OK Gray Power Ok is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation (+5 VDC when power is Ok) 9 5VSB Purple +5 VDC Standby Voltage (max 10mA, max 2A in ATX 2.2 spec) 10 12V Yellow +12 VDC 11 12V Yellow +12 VDC 12 3.3V Orange +3.3 VDC 13 3.3V Orange +3.3 VDC. ATX V2.3 / EPS12V V2.92 both define that the PSU has to use remote sensing to compensate cable drops on the 3.3V line. Because of this there is an additional brown cable crimped together with the orange cable either to pin 13 (ATX) or pin 1 (EPS12V). 14 -12V Blue -12 VDC 15 COM Black Ground 16 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF. 17 COM Black Ground 18 COM Black Ground 19 COM Black Ground 20 -5V White -5 VDC (this is optional on newer ATX-2 supplies, it is for use with older AT class expansion cards and can be omitted on newer units) 21 +5V Red +5 VDC 22 +5V Red +5 VDC 23 +5V Red +5 VDC 24 COM Black Ground /PSON activated by pressing and releasing the power button while the power supply is in standby mode. Activating /PSON connects the power supply's /PSON input to ground, thereby switching the power supply to full-on condition.

Feb 26, 2015 | Compaq Computers & Internet

2 Answers

How to install power supply


get replacement first

turn off tower

remove all wires and connections

find case screws on back remove and put in a careful place

ground your hands with a strap to chassis

find power supply and trace power cables to board (2 or 3)

remove power cables

remove screws from power supply freeing from chassis

replace with new supply

plug in cables in same place as old one

close chassis

hook up wires to computer

count down from 10(just kidding)

maybe you get lucky

Jun 01, 2012 | HP Pavilion 735n Notebook

1 Answer

System dead


Hi Fr.David
You mention '..info on BIOS..'
Is your BIOS (or anything) displaying on the screen?
If screen is also dead, then your PSU 5V (red) section is suspect.
As the fans are fanning then 12V DC (yellow) is still OK.
To check your PSU, unplug & disconnect all power connector cables (note where they go, esp the M/Board supply).
Some PSU's have a green 'signal good' wire which to test must be grounded with a paper-clip etc to black.
This tells the Power Supply Unit to start up.
Black is common negative, Yellow 12V positive, Red 5V positive.
I'm positive.
I hope your test results are not too negative. ;)
Hope this helps.
Clive.

Oct 28, 2017 | Mach Speed (MSNV-939) Motherboard

1 Answer

Regarding turning on my HP pavilion 520n, I have noticed that there are no obviously blown capacitors, and that the green led on the back which is lit when I plug it in, shuts off when I push the power...


Difficult to say at this stage. If the fans on the PSU spin when the power button is pressed in and held, it would indicate that there is power to the PSU, but that does not rule out a faulty PSU

I'm suspicious about the fact you need to hold in the power button, which is normally a way of switching OFF the computer.

Might I suggest you try the following:

1.) As suggested before, remove the power switch connector to the Fpanel header on the board (should be labelled PW or pW switch). using two single pin connectors on the end of a piece of wire, connect them to the pins (does not matter in which order). Plug the computer in and touch the ends of the wires from the pins together briefly, if the computer boots, then the issue lies with the switch aseembly. If you are unhappy about doing this, you can use a multimeter set to the ohms scale and place one probe in each of the wires that go to the switch. Press the switch and hold it and see if you get a reading.You should get a reading and this will drop as soon as you let go the switch

2.) Replace the power supply and see if that works. This is the second cheapest option.

3.) If a new PSU does not work, then the issue must lie with the motherboard. I'm assuming you have already checked that the main multi cable is FIRMLY in the socket and the subsidiary 4 pin Black and Yellow cable is in the seperate socket

Dec 28, 2010 | HP Pavilion 520N PC Desktop

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.
https://en.wikipedia.org/wiki/ATX


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

1 Answer

Power LED is On but system doesnot start ?


hello, I have a solution for u i think it may help for u.
your problem is:

When u press the start button... the power LED comes on but there is no POST beep or BIOS screen or boot up. The SMPS fan and Processor fans also dont come on at all. there is a small LED next to the SMPS plug on the motherboard that does light up when the system is connected to a power source.
Part of the system configuration is the kind of PSU you have in your system.
SOLUTION IS
So, what kind of PSU?

Try to borrow a known good PSU. Or better yet, see if you can test your PSU in another working system. If you cannot do that, try to borrow a DMM to measure the voltages. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead.

Jul 01, 2010 | ASUS P4P800 SE (890552603657) Motherboard

2 Answers

Faulty power supply or MOtherboard?


Test the Power Supply first.

If you have a multimeter, use the Positive (Red) probe lead to connect to the power wire to be checked.
The Negative (Black) lead connects to ANY ground wire. (ALL Black wires are Ground wires)

Three main voltages are produced by a personal computer Power Supply.
1) Orange insulated wires are 3.3 Volt
2) Red wires are 5 Volt
3) Yellow wires are 12 Volt.
(Again, ANY Black wire is a Ground wire)

Or use an economical power supply tester.
One example,

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

You are making a connection from the green Soft Power On wire, to any Ground (Black) wire with that jumper wire.

Using an HP Pavilion A1330E desktop computer for an example,
we can see that the main power cable is a 24-pin ATX main power cable.

This is readily shown by looking at the motherboard,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00496280&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=1829044

Scroll down to the motherboard illustration, and the motherboard photo underneath the illustration.

This is the pin-out for a 24-pin ATX main power cable, and connector,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

The Green wire (Pin 16) is the Soft Power On wire. The other end of the jumper can touch ANY Black ground wire.

1) ALL the lights use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts.
3) A typical Processor can use anywhere from 51 to 125 Watts. Depends on what Processor it is.

The three Processor options for the Pavilion A1330E are, (Socket 939 style),

A) AMD Athlon 64 X2 4800+
B) AMD Athlon 64 4000+
C) AMD Sempron 3200+

The Sempron 3200+ can use up to 62 Watts
Athlon 64 X2 4800+, 110 watts, and Athlon 64 4000+ can use up to 89 Watts.

Point?
You have nothing but the motherboard plugged in, and the Power Supply takes a 'nose dive'.
Power LED turns off.

Bad Electrolytic Capacitors in the Power Supply.
Replace power supply.

What causes this?
1) Most computer failure can be attributed to the inside of the computer is dirty, as well as the Power Supply.

When the cooling components of the Power Supply, (Fan, and internal Heatsinks), are clogged, the cooling capacity drops tremendously.

Heat = Wasted Energy

The Power Supply tries to keep up with the call for power, and eventually components inside the Power Supply fail.

A can of compressed air for computers, used on a regular basis as needed could prevent this. (Observe Anti-Static precautions Before placing hands inside computer)

2) Cheap quality power supply.
Saves the computer manufacturer money.

May 22, 2010 | HP Pavilion A1330E Customizable PC...

2 Answers

My computer wont turn on


take out the psu completely from the cpu/tower, plug in the power cord,if there is a switch on the psu turn it on, next locate the main power connector (24pin) and find green wire,take a piece of wire and insert it into the green wire connector,next touch the other end of the wire to the psu outer case or a black wire on the main connector,if all is well the psu will turn on,if you have a dc voltage tester check the voltages on the red and black wires on molex connector...5vdc,yellow and black...12vdc.if ok look at the main board and inspect the capacitors to see if they are swollen, if ok
replace psu and disconnect hdd,cd/dvd,floppy ect from main board only leave memory,processor and video, power on if ok shut off and reconnect hdd, power on, if ok shutoff and connect floppy, if ok power off and connect cd/dvd drive.during this testing you will know what is bad.let me know how it turns out.email; arjoon.ken@gmail.com

Feb 19, 2010 | Computers & Internet

1 Answer

Monitor comes on momentarilly, then screen turns black. when power is turned off and back on again, screen comes on for a second, then goes black again. Is this a bad monitor?


The only problem that causes the power on and off is a bad power supply. Go onto http://www.ebay.com and search for the monitor (power supply). My dad's old LCD screen had a bad power supply, but I found my old printer power cable (HP PSC 750 All-in-One Printer), and the monitor turned on successfully. It's not a bad monitor, unless the PSU hookup is like the PC ATX/Baby-AT PSU cable, then it might be the issue. Monitors before 2004 or 2005 have the ones, like the HP PSC 750 uses. The monitor is either defective, or the power supply is dead.

p.s.: check the voltage, amp usage, etc. on the PSU for the monitor for better results.

Aug 28, 2009 | Gateway FPD 1730 17 in. Flat Panel LCD...

1 Answer

The computer turns off after about five seconds without POST


wow complex post...
does it run with no battery (yes/no)
is the coil cell at 3vdc? below 2.9v is bad. as all are this old.
PSU is destop yours is powerpack with 2 pins only.
19v 65wattes is it? is there voltage 19v plugged in and 19v
during the 5 magic seconds?
two yellow and 2 black wires (what?) no photos posted.
if you disconnect those wires and the battery is out
it can not run. ever. so that is confusing, that statement.
keep in mind I cant watch you. or SEE IT,


either the pack is wrong (no photo of the end cable presented or watts and volts stated on the label..
no photo of your internal cable. at all so i can see its CORRECT.

this is what exits the power pack. there are no colored wires
here, unless damaged.
the PC does have a mother board jack or cable adaptor (bettery)
if you look close the 4 wires there come to 2 pins.


pack1-dk0pz4skzhn0ejlmjtxkbv00-3-0.jpg there are no books on this PC now, at HP
and parts for it are hard to find, cept PACK.
very few parts, now.
why do this>
why not just go to goodwill and find a newer PC.
end the horrors of very old COMPAQs.
get one with W7 or newer COA sticker (hp) on the bottom!

Jul 16, 2017 | Compaq Presario V5102NR Notebook

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