As for the password, well, you either remember it or you factory-reset your tablet and lose everything in it. I don't doubt the tablet's yours, but that's kinda the point of a password-protected device.
As for it not turning on, it's probably due to the fact that it's not charging. Unfortunately, it can be a number of things why it's not: Dead battery, loose USB connector, faulty charger/cable. I would first try to use a different charger and cable and see if that helps. If not, you're pretty much out of options and should either try to diagnose/repair the USB port yourself or take the device in to an authorized service shop.