does it have a little light by where the plug goes into the laptop and does that light up?
hp/compaq are junk (at least this series like yours and the hp pavilition series have lots of issue.
yes the powwer bricks die easily, but if it has nvidia graphics it may also have a failed mobo, since the nvidia graphics chip overheat due to hps insufficient cooling and other solder issues and then the chip desolders itself