My friend has hp pavilion dv6152eu. When you press start button,screen is coming black and you can hear 3 beeps. One long and two short. But sometimes it's starts normaly!!! Everyone says that video card is broken, but if the video card is broken l think it wont start at all,but now sometimes it's starts,sometimes not. ones this site helped me to unlock bios password for my dell,when no one could help me,so l beleve this time as well l will find the profesional advice. And sorry lads for my english 
thanks
thanks