Question about HP (399542-B21) 700-Watt Power Supply

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Laptop won't come on

My hp compaq nc4400 laptop won't come on due to the battery is dead and it will not reg. that the power cord is hooked up. Any help

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Re: Laptop won't come on

Ebay has a battery here is the number
Item number: 360007969648

Posted on Dec 29, 2007

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Hey my compaq labtop battery wont work i tried everything like charging all night -nothing please if you know how to fix this please e-mail me at

The battery may have a failed protective device inside of it. If it new, the battery should be covered by warranty.

When the battery is installed in laptop and charger plugged in, there should be a light on laptop that lights up to show it is plugged into a charging source/ power source.

if the light does not light, see if it will light up with battery removed from laptop. If it does not light up, and you cannot power up the laptop- the power supply has failed.

Dec 28, 2011 | Compaq System Power Supplies

1 Answer

I have a HP/Compaq 6510b laptop computer and it will not turn on...I have the charger plugged in and the only thing happening is the green light periodically flashes...Is the battery bad?

IF the battery is bad the charge lndicator on the laptop will flash (But not periodically) it will be a constant on-off-on-off..... Best check would be to remove the battery completely and use the adapter/charger power supply only. If it still does not turn on then you either have a bad power jack connection or a more serious motherboard problem. Also is the green light flashing on the adapter/charger or is it the charge/battery indicator on the laptop?

Feb 17, 2011 | HP Original HP COMPAQ 6510b 6515b 6710b AC...

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My laptop will not power up

Do you mean there is no sign of life in your laptop??? If yes then there are a number of reasons for it. The dead battery, but should run when plugged into mains. Dead power-on switch on the laptop. Bad BIOS chip. Disconnected motherboard. A bad BIOS chip is unlikely but a bad power-on switch is very likely. And for both these items you will have to open up the laptop. And then replace the power-on switch.

Dec 03, 2009 | Compaq System Power Supplies

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Have a Gateway Laptop Computer Model #MT6708. Previously computer had blank screen and no power. Currently purchased new battery and power cord. Computer now operating screen and power is on. However, when...

First thing check that the battery charge light is on when the battery and the charger are connected.
If it is it indicates that the power supply is charging the battery,
If it isnt it may indicate a fault with the battery or that the charger is not compatable with the laptop or that there is a fault with the charger.
If the battery is charging then try running the laptop on battery only without the charger and on charger only without the battery.
This will eliminate which one is faulty.

You mentioned that if you wiggle the cord then the light comes on again.
Check to see if the charger end plug is lose or the actual port on the laptop is lose.
If the charger plug is lose then return to seller and make sure they gave you the correct charger. if the actual port on laptop is lose then perhaps u got a bad connection and you need electrician or local laptop technician to open it up and solder properly on motherboard.

Let me know how it goes.

Oct 26, 2009 | Gateway System Power Supplies

1 Answer

I was using my laptop in an aircraft on battery power. there was a lot of moisture from the airconditioning and switched off the laptop. On powering on at home the battery just died and since then it is...

it means you have to get another battery. must make sure you have taken care of the moisture which might be on your battery connector port so that you don't lose the next battery you instal

Aug 24, 2009 | HP Compaq (319235-001) for Presario 5100 /...

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Won't charge

The plug in terminal that is soldered to a board inside the laptop has a loose solder connection. This procedure require opening the laptop and some soldering iron, and some solder. If you are not confident in doing this don't try it cuz you can mess up your laptop forever.

Aug 15, 2009 | Compaq (480082-001)...

1 Answer

How to activate mute button in laptop compaq presario V6000

goto google enter "compact presario drivers" click on link to HP Support and drivers. once there, enter your product name/number. it should show you a list of all drivers available for your model. download your audio driver and reload it to your laptop. sometimes drivers get currupt and dont work right. hope this helps...good luck

Mar 18, 2009 | Compaq 220W Power Supply for Presario...

1 Answer

HP Laptop

unplug the adapter from laptop, then take battery out adn wait 5 to 10 secs, then reinsert battery and try turn it ON
if that doesn't work, take battery out and try power ON with adapter only.

Jul 15, 2008 | System Power Supplies

3 Answers

Mx35 no power

Hi, can you use a multimeter? If so then check on the power suply what the voltage output should be for that unit. Then with the power turned on GREAT CAUTION MUST BE TAKEN AT THIS STAGE AS TESTING THE WRONG END COULD CAUSE ELECTROCUTION use the meter to test the laptop end plug only and see what power output you have. If you can not do this then take the power supply to a technician and have it tested. If ok = dead battery, if not replace power unit. Regards mistyman

Sep 01, 2007 | Toshiba PA2502U - Libretto 100, 110,...

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