Yikes! That's no good. Let's see if we can get it back up and running. You mentioned that you can't factory reset your phone, but have you tried holding down the volume and power button for 45 seconds? That will usually initiate a soft reset and boot your phone back up. If that doesn't work, try pulling the battery out of your phone: Battery: Samsung Galaxy On5 .
Please let me know if either of those steps worked. We can continue troubleshooting if you're still unable to turn your phone on.
Just checking in here to see if you still need any assistance. Please let us know.