Hello, my name is Rusty. I'm sorry to be the one to inform you, but using the battery grip and the battery fries the camera. You're going to have to send it to Nikon for repair. That's too much voltage, and it fries electronics. Click here to get started with the repair.
Always be sure to remove the battery when using a battery grip on any camera.
Click here, and look at the troubleshooting section. Although this one is for Canon, the power works the exact same way. If you add more batteries in series, which is what the grip does, it increases the voltage 1.5 volts for each battery.
Hmm, I'm seeing that other users are using it with the battery. If it's wired right, it will give you a parallel connection which doubles the battery, not the voltage. There's something else going on there... Remove the grip, and the battery, and let the camera sit for a few minutes. Be sure the battery is charged, and try to turn it on without the grip. If you still get nothing, plug it into your computer, and see if it can be detected by your computer.
It doesn't matter who the manufacturer is, batteries work the same no matter which device they are used. The way they are connected changes between serial and parallel connections.
Sorry, it's not me sending the call messages, they are automated from the site.