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Re: wont charge past 58%
After you got the new battery did you discharge it completely? meaning used it to the point where there was zero charge. And then charge it. This prolongs battery life. But even if you did not it should still not only charge till 58% so best suggestion while its new send it back.
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try changing the battery. Sometimes the battery can be bad, not keeping a charge long enough to allow the computer to power on.
Try a new power cord. First thing is, there can be a short that intermittently causes the computer to show as charging, but it stops actually charging after letting go of the plug. Second, the cord is going bad and not allowing a full charge to go through.
apparently this is a common problem on these models. You may need a new AC Socket - you can buy oin ebay, but you have to take the motherboard out to fit it. If you wiggle the plug gently to get it connected it may work. If its jammed up - you might try taking out the bios battery on the motherboard to reset - it worked on mine.
It could be that your battery is defective/worn out. If the computer just shuts off immediately (doesnt try to hibernate/standby) then you're likely looking at replacing the battery. They can suddenly do things like this if a cell shorts out in the battery or due to common wear. But first, here are a couple of things you can try.
1. Try reseating the battery (pull it out and put it back in). Sometimes something that simple can fix the problem. 2. Try to calibrate the battery. Your computer may come with instructions on how to do this, but if not you can do it manually. Turn the computer on but go into BIOS (press F10 at the compaq logo screen). Don't load your operating system Unplug your computer. If it turns off at this point, your battery is already toasted. Replace it. If the computer keeps running, let it go until it finally shuts off due to battery drain. Then plug it back in and let it recharge completely. This will let the microchip in the battery learn its charge potential and may allow you to get more life out of it.
Note: Calibrating these batteries is good practice but it shouldn't be done very often. If your calibration doesn't work after 1 or 2 tries, you probably still are looking at a dead battery.