Help! Unable to boot into Mac after installing Windows 7

i installed windows 7 on 2011 27" imac (running lion 10.7.2)yesterday, before that, can boot mac os. installed windows 7 on different volume on same hard disk mac os.

when turn on computer, white screen appears, apple logo progress bar. process bar load 20% while disappear, spinning wheel show (not rainbow wheel), keep spinning

tried resetting smc, nvram, didn't work. can't repair macintosh hd in disk utility, saids theres problem. help!

-john

 

what problem stated in disk utility?

have tried of these steps too?

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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