DV7 won't power on

My son just received this laptop which was stored in a closet for an unknown length of time. We tried to turn it on and the lights come on for anywhere from .5 to 2 seconds. I was using a universal charger but I don't know if that is the issue. He said someone else used a charger that didn't work either but I have no idea if it was the correct charger. In any case, I disconnected the battery and tried to see if it would start with just the charger and it did not. No lights, no nothing. I'm not sure if that is normal.... Anyway, I ordered a cheap battery and when it cme, my son put it in and it worked great. I'm assuming the battery came with a charge because when I came home and tried it, I'm back to square 1....
No power. Only lights for a second.... no beeps. Any ideas?
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You probably should consider acquiring a charger that fills the power capacity and voltage that the notebook requires.
If the notebok has discrete graphics, the 90 Watt unit is required. For non discrete graphics models, the 65 Watt unit is adequate.
Output Voltage:18.5V
Curent capacity: 3.5A
I tend to stay with the HP chargers instead of the generic units.
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2015 Microsoft MVP - Windows Experience Consumer

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WARNING!
this mod puts your computer over-voltage by a few volts and i am NOT responsible for your loss if you do this mod incorrectly!
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* Your warranty is now void.
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http://www.youtube.com/watch?v=In5JoDVlZ0Y
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Sorry about the long title.....its my first post.
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DV7 won't power on

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