Mac mini shuts down during startup

Lately my Mac mini running osx lion got really slow and then when I shut it down for the night the next morning I tried to boot it up. It didn't boot up after 2 hours of grey screen and spinning wheel. I tried clearing my NVRAM but nothing happened. After that I tried to repair the disk but it said "cannot repair disk, backup as many files as you can and reformat the disk". After that I tried to reboot again and After about 30 seconds it shut down. During those 30 seconds it was normal except for there was this loading bar at the bottom. I have no Mac osx install disk because when I upgraded I just did it through the app store. Is there any way to backup my files without being able to use my computer?

See if the Mini will boot into Target mode...
http://support.apple.com/kb/HT1661
If so it shoud appear as a FW drive the other Mac, we can check the system logs on the Mini for clues, or perhaps Repair the Disk if the other Mac is same OSX or newer.

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    0xffffff8211f33730 : 0xffffff802816140e
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  • Mac Mini Shutting off during boot

    Hello Everyone - hope I can get some help on this..
    I've got an Intel-based Mac Mini, which suddenly (after changing the video resolution - at least that's the last thing I did before this changed), boots to the Apple logo, with the spinning logo underneath.. This then spins for about 30 seconds (normal time), and then the Mac Mini shuts off..
    I've reset the SMC and PMU, but no joy..
    Help!
    Thanks in advance!
    SB

    Did a full reinstall of Leopard - that seems to have fixed the issue.. A smidge draconian, but effective nonetheless...

  • Mac shuts down during startup after removal AppleSetupDone in Terminal, can I fix this ? 'touch' didn't help.

    Hi, first of all thanks for reading, and I apologize for fooling around in Terminal.
    I followed a method to remove applesetupdone in terminal, in order to enter the menu to create a new admin account. I had done this before on a computer that was given to me and it had worked very well. This time it didn't, though. I know I used a different website this time, I'm pretty sure the previous one made use of sudo, this one didn't.
    I must have done something wrong. Perhaps when I followed a hint that came up inside terminal that told me to load something, because what I wanted was impossible / read only.
    In any case my MacMini (1.83 ghz, Snow Leopard) starts up and shows the grey apple logo and the progress 'wheel', then shuts itself down. It does not mount when I connect it to my macbook with firewire. I can still get into sum / terminal but I don't know what to do. I tried 'touch' to restore applesetupdone but it didn't work.
    I would really appreciate any help.
    Thanks in advance!

    Humm.. you'll need to startup from your System Install Disc to test, repair or restore from Time Machine.
    Some options for Starting up from your Install Disc include:
    1. in an External Optical DVD Drive.
    2. from another iMac in Target Disk Mode.
    3. from a copy on a Thumb Drive or External HD.
    It's to bad that you are using Time Machine on the second HD instead of a clone with Carbon Copy Cloner - Home or SuperDuper! that you could boot from for testing, repairing and/or restoring.
    If none of the above helps?
    There is one good thing about a Mac Mini, it is much easier to tote into the local Apple Store or AASP than an iMac. see > Apple - Support - iMac - Service FAQ

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