Booting a tablet by a new person

How and what apps do I need to reboot a tablet? can a new person accomplish this with no experience in flash booting? My tablet crashed due to improper instilation of music video and the fact that I was haveing battery problem from the day that I bought it used. If I buy a new battery on E-Bay and it does not start what is the next step? Is it worth a new battery as a Coby?