Now our PiTFT display and Gamepad PCB are mounted to the case. Press the buttons on the PiTFT and Gamepad to test them and see they feel good. If the buttons get stuck, the gamepad isn't flush with the standoffs.
Let's go ahead and pop the speaker into the case. Lay the speaker over the cavity with the grill and press it down to snap it into place. The wire should be oriented in a position so it's not in the way of the corner standoff.
Now if a good time to insert the slide switch into the bottom case. Take note of the OFF position of the slide and install it to your liking (I prefer down is OFF, up is ON).
Grab the lipo battery and plug in the JST connector to the JST port on the PowerBoost 1000C. Flip the slide switch on, and see if the circuit works! The blue LED indicates the battery is charged and the circuit is powered on.
If the LED doesn't light up, you either have a defective PowerBoost, or a short. You'll have to double check your wiring for short using a a multi-meter. If you have any issues or questions, please post it on support forums at http://forums.adafruit.com/