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.
SOURCE: Fuji Fine Pix Z5 battery won't charge
I had the same problem!! Try flipping the battery around and then charging it. It worked for me! Hope this helps!
SOURCE: Fuji Fine Pix Z5 battery won't charge
I looked up this question with the same problem and while the battery was placed in with the right side in, the three metal tabs weren't on the right side with the three metal chargers- so I had to spin it around the other way...i hope i'm explaining this right...now it's charging! I am so glad. This camera is excellent.
SOURCE: hp compaq nx7400 - battery died and power cord will not turn comp
If your system won't boot up with just the AC adapter connected, it means to say that there's a problem with the AC adapter or the motherboard of the computer. Basically, if the AC adapter or the motherboard is damaged, you won't get a charged battery. If there's another AC adapter that you can try your computer with then that will be great. If antoher AC adapter works, then you just have the AC adapter replaced. If a known AC adapter didn't work then you may need to consider replacing the motherboard of the computer.
SOURCE: hp compaq nx7400 - battery died and power cord will not turn comp
Do you have another power cord to check? Most places like bestbuy is willing to let you test a universal power cord for your type of laptop before you buy. Usually in your case, the power cord or connector has gone bad. If you test the laptop at the store and it doesnt work then its your connector but if it works. you could consider buying that power cord.
SOURCE: Compaq Presario A900 won't turn on, and battery
The power connector for these Compaqs are notorious for failing when they get a bit grimy. Try wiggling the connector or cleaning it or even gently squeezing with pliers.
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