Cannot boot computer

tried to turn on my computer this morning, and suddenly it won't even turn on. I push the on button and it sits on the screen with the apple for a long time before replacing it with a circle with a line through it (kind of like a null set).
I try restarting holding down the option key, and it can't find either my mac hard drive or my partition for windows. The partition for windows has worked successfully for over a month, so I don't think that's the issue.
Any ideas what could be going on here? I really have no idea what to do, and I'm really worried I'm going to lose all my data.

Try booting from you DVD drive by holding down the C key with the install disk in. Then when you get to the window with a menu bar look there for Disk Utility and try repairing permissions. Sounds like your hard drive may be failing this could cause it not to see either partition on start up.

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  • Cannot boot computer out of safeboot after installing OS X Yosemite

    Hello,
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    Update:
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  • Cannot boot computer at all after partitioning in windows

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  • Cannot boot computer past apple logo, text is displayed saying aDebugger called panic ?

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  • Curve 8320 corrupts OS periodically and then cannot boot (blinking LED only)

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  • Kernel Panic / G4 dp500 / Cannot boot currently

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    The X Lab (Troubleshooting & Maintenance of OS X)
    OS X Routine Maintenance & Generic Troubleshooting
    Prevent Mac Disasters
    Kernel Panic
    Mac OS X Kernel Panic FAQ
    Mac OS X Kernel Panic FAQ
    Resolving Kernel Panics
    12-Step Program to Isolate Freezes and/or Kernel Panics
     Cheers, Tom

  • Cannot boot into Windows XP, should I replace hard drive?

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    Go to Solution.

    My plan is to try to use the TOSHIBA Recovery and Applications/Drivers DVD to load the WIndows XP files onto the hard drive, then use the Windows XP Recovery console CD I downloaded from here
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  • Cannot boot from osx or cd, help

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    Message was edited by: dve_

  • Cannot boot from 750GB Western Digital Scorpio Black

    I just installed a new 750GB 7200rpm Western Digital Scorpio Black in my early 2008 15" MacBook Pro (last pre-unibody). I can boot the computer from the Scorpio Black when it's in an external enclosure, I can boot another computer, a MacBook, from the Scorpio Black via firewire while that's installed in my MacBook Pro, but what I cannot do is get the MacBook Pro to boot off the Scorpio Black as the internal drive. It will recognize it and show the main and recovery partititions, but it won't boot the OS (10.7.1.).
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  • Cannot boot from DVD since 10.4.6 update.

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  • Cannot boot my MacBook Pro. Tryed CMD+R, reinstall OS, error message :damaged HD. When trying to repait it says it's OK. Yesterday HD wasn't even half full when I turned it off, now it says it's full.

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  • Lenovo G450 cannot boot !!

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    hi Lisa12,
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            This seemed to be a POST Issue
        POST will check Main Components of the computer like
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                  Processor
                  RAM(Memory)
                  HDD
                  GPU
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         Try cleaning the Memory pin connectors you can follow this post
    > Try an external display to isolate Display Issue
    If all this Did not work I would suggest calling Technical Support  for assistanceto have the Mainboard Checked
        Might be an Issue with the Processor, GPU or the Mainboard itself.
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    Solid Cruver,
    Did someone help you today? Press the star on the left to thank them with a Kudo!
    If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
    Follow @LenovoForums on Twitter!

  • HELP CANNOT BOOT

    ok, my mbp was working fine for a bit, but when i tried to use time machine it didnt work with error -43 "file not found". i figured it just wasnt installed properly. so i booted up my leopard install disc and did archive and install. well, about twenty minutes in to the installation it came up with an error, saying that it could not install "BSD" (i dont know what that it)". not thinking anything of it i just restarted and tried to install again. only this time, when it checked to see if i had osx 10.4 or later, it denied that i did. i suspect that the original installation was interupted before it could install a working os, because i cannot boot the os at all.
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    Well this sort of calls for extreme measures:
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  • TS1587 My iMac 27" model mid 2010 cannot boot

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