How do I factory reset when my Sprint LG phone that won't boot? I have a Sprint LG model# LS670.

When turning on the power it just displays the Android logo in a loop.

How do I factory reset it?
Make sure the device isn't connected to power through the usb.
Take out the battery if the device is on to turn it off.
Put the battery back in.
For about 10 seconds hold the volume up, home key, and the power button to turn it back on. Keep holding until the Android system recovery menu loads.
Use the volume down button to navigate to wipe data/factory reset
Press the button with 4 squares (menu).
Another menu will appear to confirm you want to wipe the data. Use the volume to navigate down to Yes and press the menu button.
Reboot the phone through the menu.