Every time i boost up my Mac it doesn't go to Mac OS X

hey guys looking on sum thing had windows partition on imac got corrupted on me , try fix ****** big time
ended reformatting partition mac os extended (journaled) every time boot mac ask me inserts boot cd
there way fix this?

 

you need reinstall mac os x seems, or able boot mac os x via holding down option button right after startup sound?
, did format software? did format boot camp partition via disk utility perhaps?

have tried of these steps?

mac doesn't boot

resolve startup issues , perform disk maintenance disk utility , fsck

troubleshooting: computer won't turn on

a flashing question mark appears when start mac​

 

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