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Press and hold down the Power button for 10-20 seconds and this will force reboot it. If that didn't work, then press and hold down Power and Volume Down/Up for 10-20 seconds and this will soft reset it.
If it still not working and if your phone has a removable battery, then take out the battery, wait 2 minutes, put it back and turn it on.
Please let me know if that didn't work, so we can continue troubleshooting.
Remember, this is not my final answer. If my solutions didn't work please don't rate me bad or poor. Instead please reply back to me and I will continue to help you until we fix the problem or you are satisfied.
Hi there, I'm just checking. How is it going ?