I need to know how long is a Canon (40d in my case) life, I mean how many shots can take in its life.

The camera broke down: the main circuit is totally damaged (unknown reason).

If its main circuit is repaired (very very expensive: euro 300), does
the camera's life start from zero again? It becomes "new" again?

Any technical help and advise is much appreciated.

Sorry for my non-technical language and poor English.

Thank you.

Cristina