Apparently HP is having some issues with the batteries in these model of notebook computers.
http://h30434.www3.hp.com/t5/Noteboo...ELP/m-p/491701
You didn't list the suffix of your model, so maybe this doesn't even apply to you though.
Is it still under warranty? If so, is it convenient to take it back to where you bought it and have it tested?
Is there a computer store or a BatteriesPlus store near where you live, if so then you can have the both the charger and the battery tested. More than likely the battery has gone kaput on you.
HP notebooks are notorious for service issues in the first 2-3 years of ownership. Usually around a 30% repair / failure rate. THAT IS NOT GOOD!
Having sold notebook computers in the past and also cellphones what I have noticed is that a lot of users abuse the batteries and then when the battery goes phffffttt, they blame the maker of the computer or cellphone.
(
I am not insinuating this is what you have done... just what I have observed in the past.)
Too many times people will discharge the battery about 1/4 to 1/2 the way down and then recharge them. This is very bad for batteries even if they're Lithium Ion batteries. With new batteries it's always best to charge them fully and use them until they're almost completely drained for three full cycles. Regardless of the type of battery this is always a good practice.
For notebooks, about once a month or so after the initial use, charge it up fully and the disconnect the charger and run it on battery until nearly dead, then charge back up again. This freshens the battery and extends it's life.
My little diatribe aside... I hope you get your issue resolved quickly! Keep us posted.