I need a new power pack (Battery) for my PC. Part

I just looked at the schematic and the only problem is likely the charging, or external power connection not connecting the battery when the plug is removed. A bit of De-Oxit spray may resolve the problem, or the connector itself may need to be repaired/replaced. This happens a lot with this type of connector.

good day!
did you give it 24hrs to finish a charge?
the PC has a charging chip inside.
new battery from whom>?
the line pack is not a charger its line power pack,
it converts 120vac (or 240 outside usa) to 19vdc.(Or your spec)
the 19vdc runs the PC perfectly with no battery installed DOES IT>
that is the first test. the power pack must be the the correct pack
for:
voltage
current (never lower spec)
and watts.
if not the correct power pack it will now work correctly
the watts can be higher no problem,

if it runs ok on line power no battery
then we try the battery. (give it 24hrs for stubborn old batteries)
if the power pack is ok, it will charge, (spec pack as HP tells you)
if the battery is bad it will not.
if the charger chip in the PC is bad (MOBO BAD) then it will not

testing takes, skills and tools, one tool is a voltmeter
lacking that tool, one can only guess.
what not get your PC repaired by a TECH.???????

here is your HP page, its non trivial, no>?
see that they have 5 power packs used
that is BECAUSE they HAVE many power levels of CPU/GPU
faster rated CPU'GPU need more power.

https://support.hp.com/us-en/product/hp-compaq-nx7400-notebook-pc/1847094/how-to

you never once said
it runs perfectly on AC power only
not once
nor it does not overheat. nor if the fan works and vents all are free of lent.

that post is hard to read and no PC model told at all. Cq61?
the PC must run on AC power pack with no battery there.
does it?

99% of all cases like this the battery is bad.
you do know that most charges LIE to you when the battery is bad.
this is a fact, so savvy owner have a good spare battery.
not you so are stuck in a conundrum.
I will not go in to my 10 page thesis on why that happens
but lets so an analogy,
I look at my car and the tires look ok, but up close not.
the charge can not look inside any battery to see 1 cell is bad physically i some odd way.
there are only 3 causes.
1: wrong power pack AC mixed up with other PC etc and is wrong.
2: bad battery is 99% of all causes, for sure, even 1 year old abused
and that means running on battery all the time kills them dead fast.
ok https://batteryuniversity.com/ teaches why>?
3: bad charge chip and needs new mobo or $300 gee that cheap battery new looks like a great guess no? $15>? as does #1


"but the charger alone"?????
this i think means battery is gone???????? faIls?????
if true that means the AC power pack is bad or wrong.
the charger is a chip and is on the mopo not the power pack
the power pack is just that at AC to DC power supply pack
a key fact to learn, where things really are to diagnose real problems

learn to call it a power pack and seems yours is DOA./
all VRM and charge chips are on the mobo !
even shorted battery can cause the PC to go dead
as it overloads all power rails in he PC. (and common)

some PC ive seen , used, (wrong mix)
are sold with the wrong power pack ! the cheap one is low watts;
so seller do that BAD ACT.
PC that need 30w, 60watt or 90watt pack ,.must use the right pack.

that is because most PC have 5 CPU or 2 or 3 GPU choices new or 4 banks of faster RAM. called OPTION. new.
and burn lots of power, so the 95watt pack must be used.
or H3LL to pay for sure. and PCs run on the highest power watts pack in the series. of PC not told by you at all
no service tag data told so not waxing smarter possible.

Remove cmos battery from motherboard and clear the cmos with jumper and restart the system keyboard works on bios .....still it not works remove harddisk and cd-rom and then enter into the bios

As long as you have an empty PCI slot (white) you can buy any brand wireless card or even a USB wireless adapter

tHE 96 F IS ALMOST THE EXACT SAME AS THE MODEL YOU HAVE. THEY HAVE THE SAME POWER TO THEM THE BATTERIES WERE JUST DIFFERENT

I have a similar problem. My MV650i works from the mains power but not from the battery even though I have tried new battery packs.

Not sure how I fixed it but the controller seems to be working fine now.

get the whole laptop checked by the service center
as if the batteries and the power pack are ok there might be the problem with the mother board

Here is a Compaq document will walk you thorough a fairly lengthy procedure that should solve your problem. Here is the link: http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&lc=en&cc=us&dlc=en&product=431080&query=presario%20sr1220&dest_page=product#N561 Let us know how this turns out or if you need any additional assistance.