HELP PLZ, there is no display ,blank screen when i turn on

hey guys..
AM using Macbook pro. when i turn on, i cannt see any thing,its dark,i can hear sound but no display..how do i solve this problem..
what will be the repairing expenses and why i got this problem???..

Welcome to Apple Discussions
You have no boot volume - could indicate HD failure (or you somehow damaged/erased the system folder). You can try a restore at home... Restart holding command+r and restore your OS X. If that doesn't work yes you should take it to Apple.

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