iPhone 4s not turning on after upgrading to iOS 8.1.3

I've upgraded my iPhone 4s to 8.1.3 but after upgrade it's not turning on. I tried to restart it but no use.

When plugged in to power source it starts vibrating every 60 seconds and becomes hotter. After 3 hours of being plugged in to charger it turns on but the screen is fully blurred. If I switch it off it's not turning on again.