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Momentary switch won't turn on pc

Computer won't turn on with power supply connected to the psu have checked psu Psu checks out ok . No responce from momentary switch when pressed. Can you solve this problame for me please . Trevor.

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Open the computer and check the cable that comes from the power switch and goes to the front panel header on the motherboard. Make sure it is connected. If it is, you need to check if the switch is working. Two ways: check resistence at the end where it connects to the motherboard with it disconnected and turn switch on and off. If you don't have a ohm meter, you can also short the two pins that the power switch cable connects to. If it still doesn't power up, then it can be three things. The memory, or the cpu, or the motherboard. Swap each one at time until you determine what is causing the problem.

Posted on May 18, 2009

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Dell Inspiron desktop, will not power up.


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ok, is there any voltage appear in one of the terminal of psu or power supply is the fan of psu is running,if you suspected your psu is running or not try to unplug and disconnect your psu from the mother board,then bigger socket that contain 24 pin with different color of your psu try to connect the two pin that has a color blue and green by a small wire about 2 inches slotted at both end.then put power if the fan is run its good may be your memory or video card or processor is defected if your psu does not run replace.

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I guess your power supply died. try to disable the power supply and enable it again (switch behind the tower) otherwise you should get it checked out by a professional.

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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

http://www.pcdied.com/power.html

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)
Switch.
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


https://www.manualslib.com/download/449087/Asus-Leonite-P5lp-Le.html


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

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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

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