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Great! This is what you need to do...
1) Remove the AC Adapter
2) Remove the Battery
3) Press and Hold Down the Power Button/Switch for 1 minute EXACTLY
4) Wait 5 minutes to pass
5) Plug in the AC Adapter ONLY
6) Turn on the Laptop
If it comes back on, please shut it down normally, and insert your battery and turn it back on and all should be good. If not, while you have not had this for over 1yr, please call the HP Tech Support and have them to replace your Motherboard as it appears to be dead.
HP Support: 1-800-474-6836
BEST OF LUCK!GOD BLESS!