How do I reboot Lumia 610 and restore my database?

[WPCentral Question]

my phone 610 suddenly hanged up after a call,after then its not working at all. after i press my power bottom jst only it flash nokia on the screen and not starting up as before. Now how to solve the problem plz tell me. after i ut back the battery my phone is automatically restarting and the dislay is the same wit the nokia logo..............................plz help me