Laptop turns off sporadically

Hello,

I have a HP pavil;ion zv 5000 and it turns off sporadically. I keep it plugged in and i dont depend on the battery at all. Its not running too hot, i have a lap fan thing with two more fans underneath. I'm guessing that the power socket needs to be re-soldered to the motherboard? anyone want to help out and throw a few more troubleshooting tips in before i tear this thing apart?

thanks,

dan