Computer not turning on

Hello,

i have HP pavilion ZD8000 laptop, laptop charger stoped working because of the wire creack, then i stoped using this computer, after 6 months i bought new charger, my computer start first time, now when i pressing power button all lights coming on and go's off right way, my computer is not moving at all. i tried take out better, then take power supply and hold power for 30sec and put it back, it didn't work. i dont know what wrong with it..can some help? thank you