Have a compaq presario running win 7. The system does not recognize when it is running on ac power (original ac adapter). The battery charges but the only sign of this is the battery icon says xx% remaining (value increases). If I pull the battery once booted the icon shows being on ac power. If I reinstall the battery the ac icon changes to the battery icon and I am back to xx% remaining. The adapter will charge the battery back to 100%. If I try to boot with only AC power applied the system will not start (no lights DOA). If I pull the battery and tell the system to restart it will reboot using ac power only. Help!

go to compaq's website, download the latest Bios Update, run the bios update while the power suply is connected on the laptop. after the update, the power adapter should be recognized by the laptop

just see it from http://www.udtek.com/hp-pavilion-dv9000-ac-adapter-90w-185v-49a-p-2970.html.may this is good for you.

THE COMPUTER DOESN'T EXACTLY CHARGE THE BATTERY. MAYBE THE ADAPTER FOR THE C502US ISN'T COMPATIBLE WITH UR COMPUTER, OR THE ADAPTER CONNECTION AT THE COMPUTER/ MOTHERBOARD IS FAULTY.

the Dell AC adapter has a sensing pin so the bios can determine the wattage of the adapter. If the system cannot ID the adapter, the battery charger circuit is disabled. You'll need a functional DELL ac adapter to get the battery to charge

Some laptops will not power up with a completely discharged or faulty battery. Remove the battery from the laptop, plug in the power cord and try to boot the system. If the system boots, your battery needs to be replaced. Replace your battery as soon as you can, it's not a good idea to run the laptop for extended periods with an open battery bay.

The notebook battery may have a defect if it will not power on the notebook and if it will not hold a charge. The battery indicator light on the notebook either does not light or always blinks orange. The notebook operates correctly when connected to the AC adapter.
A battery that will not charge may be the result of an AC adapter failure, a system board failure, or a battery failure. Perform the steps below to diagnose the failure.
Troubleshoot the power supply
To verify that the AC power supply is functioning properly, follow the steps below.

1.
Plug the AC adapter directly into a functioning wall outlet, and plug connector into the computer. Do not plug into a power strip, surge protector or secondary power source.
2.
Verify the following operation and take the appropriate action:
*
That all power cord connections are secure.
If the AC adapter connection to the notebook is loose, the connector may be damaged and require repair. Contact HP service and support for further assistance.
*
That the power button or power LED is lit when the computer is on.
*
That an LED on the AC power supply adapter is lit when plugged into an AC wall outlet (not available on all AC power supply adapters).
*
That the AC power supply adapter is the correct type.
Different notebook models require different AC power supply adapters. You will need to know the Product Number of your notebook to determine the Part Number of the replacement part. Click Start > HP Help & Support to view the product name, product number, and serial number that you'll need to have to speak with HP Customer Service.
View the See Also section for information about locating HP Help & Support in your operating system.

Troubleshoot the System Board
If you've verified that the AC power functions properly, troubleshoot the PC's system board by following the steps below.

1.
Remove the battery, and keep the notebook connected to AC power.
2.
Press and release the Power button to start the computer.
*
If the notebook PC powers on , then the AC adapter and system board are functioning properly. Go to Troubleshoot the battery .
*
If the Power LED is off , then the AC power adapter needs to be replaced. Contact HP Service and Support for further assistance.
*
If the power LED is on , but the notebook PC does not power on, then the notebook PC needs to be repaired. Contact HP Service and Support for further assistance.
3.
Shut down Windows by selecting Shut Down from the Start Menu.

Troubleshoot the battery
If you have verified the AC power supply and system board are functioning correctly, troubleshoot the battery by following the steps below.

1.
Insert the battery into the battery compartment on the bottom of the notebook PC.
2.
Connect the AC power supply and allow the battery to charge for 15 to 30 minutes.
NOTE: The Battery Charging light should be on while the battery is charging. If it is not on, check the AC power adapter connection to the notebook PC.
3.
Unplug the AC power adapter cord from the notebook PC.
4.
Press and release the Power button to start the computer using only the battery as the power source.
*
If the PC does not power on, then the battery needs to be replaced. Contact HP service and support for further assistance.
*
If the notebook PC does power on, the battery is functioning properly.
NOTE: If you have purchased a second battery for your notebook PC or you have access to an identical battery, you can also check the battery by inserting the second battery into the PC and performing the Troubleshoot the battery steps again.

Hello,
This is true, you will not be able to charge the battery without the correct charger. For mostly all laptops, when the charger is not maintaining a charge, it is time for a new one. However, it does not have to be the manufacturer's adapter, but I recommend purchasing the battery made for the Compaq Presario M2000 Notebook.
NextTag.com has decent deals on these adapters. http://www.nextag.com/ac-adapter-compaq-presario-m2000/search-html

I hope this helps. Please let me know if you have any other questions.
Thank You, Raph30

eather you have one or a couple of the following problems,

1. you have a bad battery
2. the power supply is defective
3. the charging circuit in the laptop is defective and the motherboard will require replacement or repaired.


Dennis

dear N9YK

you can follow this

If you have a loose connection where you plug in the power on your laptop, or it works intermittently, you could have a bad dc jack. Symptoms

• Move the power plug and the laptop loses connection
• Broken or cracked dc jack
• Laptop won't charge but worked on battery
• Power LED and battery LED flicker when the adapter tip is moved
• Battery won't charge
• Sparks come out the back of the laptop

Why does this happen?

• Flaw in manufacturer designs
• Use of universal or non-original ac adapter
• Lots of plugging and unplugging of the ac adapter

• Tripping on or pulling the ac adapter cord

or you can check your dc amper in your adaptor

oke



thx

cropp

hi!

i'd say first try a known working ac adapter and if that Working AC adapter works and the system detects the battery well, then it could be the ac. If not then try to borrow a working battery to get your final conclusion. if the working battery still doesnt work properly, then it could be the system motherboard. If battery and ac adapter (working) are not available, then check the BIOS and see if it really doesnt detect the battery. try flashing the BIOS and still if that fails, then replace the battery.

hope this helps!

Regards,

Karlox