Hp pavillion dv9700 won't start with Ac adapter plugged in

Dear all,
I have a 3 year old hp pavillion dv9700. The problem is that the computer won't turn on when i remove the batteries and leave the Ac adapter plugged in. The led that indicates that the adapter is plugged in is on, so that means that the adapter is working fine. But to be sure, I used another Ac adapter from another dv9700.
The next thought I had that the problem might be the Ac jacket( that is connected to the motherboard ). So I dismantled 2 dv9700 laptops (one is mine, the otherone from a friend, which is by the way working fine), and toke out the Ac jacket from the laptop that was working oke and replaced it with mine(whIch wasn't booting with the Ac adapter). And still the same problem. So now I am able to say that there is something wrong with thE motherboard.
When ever I plug in a battery that is not empty, the laptop starts up normally. The other thing that noticed is that whenever I plug in the battery the led of the Ac jacket turns on (not full bright, but somewhat dimmed). This doesn't happen normally. That means that there is somewhere a short circuit on the motherboard.
I have looked all over the internet, but wasn't able to find someone who had the same problem as me, or a solution for it.
Ps. It has nothing to do with the video card, because if that was the case, it wouldn't even start with the batteries.
Already thanks, kdeo2k

Hello @stacey71,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I have read your post on how your computer is not able to boot with the power adapter plugged in, and with no battery. Are you still able to boot into Windows with the battery installed on your notebook? I would be happy to help you, but first I would encourage you to post your product number for your computer. Below is a is an HP Support document that will demonstrate how to find your computer's product number. In addition, it will also help if you indicate which operating system you are using; and whether your operating system is 32 or 64 bit. The more information you can provide, the better!
How Do I Find My Model Number or Product Number?
Which Windows operating system am I running?
Is the Windows Version on My Computer 32-bit or 64-bit?
Please re-post with the necessary information, this way I will be able to research this further for you. I look forward to your reply!
Cheers!
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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Hp pavillion dv9700 won't start with Ac adapter plugged in

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