...hello ...nokia n72 no start-up ...on/off problems ...nothing apears on the display
...charging -works(nokia logo apears...and start charging) ...comnunicate with pc -works
...n72 on/off problems
It looks like you're going to need a hard reset. Here's some information regarding on how you can do it:
http://www.allaboutsymbian.com/forum//forum/thread/17507/