If your phone is not turning on by the conventional way of holding the button on the back of the device, there may be a problem with your battery. Try removing the back of your device and taking out the battery and after 10 seconds putting it back in. Usually that soft resets the device and has potential of making it work again.
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If any more questions or concerns please refer to the [https://www.ifixit.com/Wiki/LG_G_Stylo_Troubleshooting|LG G Stylo Troubleshooting page]
If your phone is not turning on by the conventional way of holding the button on the back of the device, there may be a problem with your battery. Try removing the back of your device and taking out the battery and after 10 seconds putting it back in. Usually that soft resets the device and has potential of making it work again.