Hmm, it may be something on the phone that didn't remove during the reset. Try loading the phone in "Safe Mode" and see if it will load. If it does, then you definitely have something on there that needs removing. If it still won't load, then you may need to do a "Hard Reset".
To get into "Safe Mode" please do the following.
1. First turn off the phone.
2. Next press and hold "Power" until you see the manufacturers logo on the screen, then release the power button.
3. "Quickly" press "Volume Down" and hold it for few seconds until you see the message "Safe mode: ON" or something similar.
4. If you wanted disable it, simply repeat the steps above, and you should see "Safe Mode: OFF" rather than on.
NOTE: Doing this will clear...