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Was the phone rooted? Was the phone dropped or immersed in water prior to this happening?
If not try Smart switch or use this since you have Verizon.
http://www.verizonwireless.com/support/knowledge-base-80201/
Download mode is volume down, home and power at the same time.
Honestly i have only used Smart switch once for a client in S Africa. As far as i remember you put the phone in download mode and it reflashes the firmware. Not sure if it backs things up or if you have a need to back anything up.I don't know if the phone was rooted. I did not modify the phone if that matters. As for dropping/ water, I have dropped the phone previously. Do keep it in a case however No exposure to water. I'll look into smart switch. Is there anything particular I need to know in using this?