PC Fujitsu Siemens DESKTOP PC mobo. dead.

REWIRE THE ELECTRIC WIIRES.SHOULD THAT NOT HELP TRY WITH A OTHER PSU.

Test the RAM as you did, only using stick at time and one slot a time. 4 slots by 4 DIMMs equals 16 different possible combinations to try.
You could also use memtest86 (Not for the novice) It is part of a free boot utility CD.http://www.hirensbootcd.org/download/ Download. Burn and use.

1) normally the pc has software diagnostic installed by the company.
RUN the software diagnostic.
2) otherwise you must open the computer and test a) voltage a the FAN coming from power supply b)if there voltage at the FAN is faulty, if NOT the problem will be in the power supply section.
God bless you

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

Asus books always show all this, but never HP for some odd reason. (details like this)
good luck

IS THAT A Relic CRT monitors/?? wow.
NOW THE FULL STORY. (GOT TIME NOW, IM IN MEX,GULF ON A BOAT,WITH SLOW WIFI OR NEAR DEAD.)

the PSU is dead if the power button acts dead
no fans right ? no sounds, the 2 or 3 fans do not spin and blow
1: bad PSU
2: or objects plugged into the mobo are shorted,
3: mobo dead (Motherboard)

do the jump test?

here
http://www.pcdied.com/power.html#Jumper

assuming that u r a professional..
hv u tested the 3.3v..the ram..the cmos battery (above +3v)..the cpu..
if so look for the smd fuse..capacitors (esp above 1000mfd)..mosfets..circuitry at the south bridge..the crystal clock generator..
hope this'll work..else contact system admin/vendor....

Probably a PSU failure, although it could just be your power switch. Try shorting the power switch connections on the motherboard, if that doesn't work, replace the PSU with a standard ATX PSU. They're relatively cheap.

A dead CPU will not hinder a board from powering up. The board is unlikely to POST. However, you should heard attempts at powering up and immediate shutdown. Or, you will see the PSU comes on but system not boot.

No mobo, but, CPU.

If no failed attempts at boot, no indicator lights, then you have either a failed power supply or DEAD motherboard.

Good luck

I suggest replacing the fans with new fans. Fans do expire and they need to be replaced.

Have you tried a secondary PSU? (though it sounds like your motherboard needs replacing)