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Your only choice is to erase the drive and reformat it or try another repair utility like Disk Warrior. Do you have a backup? Will it startup?
If it will start up in Safe Mode then you can at least backup what you need.
Please go to the Apple logo at the upper left of your computer screen to About This Mac and give me this information:
Oh yes you can try boot while holding the Shift key
OK do you know what system version it was running at least?
Oh in that case I don't need that info try to boot to Recovery HD hold Command - R until you see the Apple Logo.
If it is less than a year old it is still under Warranty if it is over 1 year old and you have Apple care then it is also still under warranty.
1. Shut down the computer. 2. Plug in the power adapter to a power source, connecting it to the Mac if its not already connected. 3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. 4. Release all the keys and the power button at the same time. 5. Press the power button to turn on the computer. 6. Press and hold the Command-Option-P-R keys before the gray screen appears. 7. Hold the keys down until the computer restarts again at least twice. 8. Release the keys then immediately hold Option Command R to boot to Internet Recovery. You may have to shut it down and start it again if you don't hold them quickly enough. With Internet Recovery you can eraser the drive and Reinstall the system.
If your info is vital and no hardware has actually failed Disk Warrior is worth a shot
It can mean a few things the system is not recognizing the drive usually which means it has failed. If you did the whole procedure try both Command -R and if that does not work Option Command R again until you can get to Utilities screen.
OK if you can't then I'm afraid there is a hardware failure of some kind and it needs repair. Sorry.
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Right I'm afraid it needs to be repaired. We have done all you can do at this point.
Right take that up with Apple.
Please remember that the experts here cannot fix failed hardware. We guarantee a correct ANSWER, even if that answer determines the product needs to be physically repaired. No one likes to hear they need to spend more money to fix the problem but at least you now know what needs to be done and you can make an informed decision.
Ok thanks, ***** *****