Do everything Karsten said, and if it does not solve, never buy HP laptop again.
HP sucks, I had a laptop fried in the middle of a business work.
Customer was angry, I was nervous, lost 3 days of work, had to buy a new laptop quickly, transfered all data (Was not in warranty anymore)...
1 and a half year only with HP and it fried...
Ever since I always go with ASUS.
I'm using ASUS G75V (Gamer Series) for programming, heavy stuff, the fans are amazing, 2 years now, and the temperatures still around 70 degrees. When I bought, temps were around 45-50 idle.
I'm planning for a repaste soon, which will bring the temps back to the stock...
Get a gamer laptop and you will never regret.
ASUS G75V
http://www.asus.com/ROG_ROG/G75VW/