IMAC starts up w/ tone, then white screen , then 1 min later grey apple - nothing else. When I boot up holding shift, no tone, white screen, grey apple, then 1 min later prohibitory sign and pinwheel ...

IMAC starts up w/ tone, then white screen, then 1 min later grey apple - nothing else.
When I boot up holding shift, no tone, white screen, grey apple, then 1 min later prohibitory sign and pinwheel ... nothing else ?

Tried disabling everything USB and FireWire and the Likes

Similar Messages

  • Mavericks install freezes with prohibitory sign and spinning wheel

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    Welcome to Apple Support Communities
    Did you check that all your apps are compatible with OS X Mavericks?
    What I recommend you to do is to get a USB drive or DVD and copy the OS X Mavericks installer to it by using Lion Diskmaker > http://liondiskmaker.com Also, make a backup of your data with Time Machine.
    Then, hold the Option (Alt) key while your computer is starting up and select your DVD or USB drive. Open Disk Utility, choose Macintosh HD in the sidebar and erase the drive, and finally, close Disk Utility and reinstall OS X. Disconnect all peripherals from your computer except the mouse, the keyboard and the USB drive or DVD, and see if OS X Mavericks is installed correctly.
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  • HT4623 omy ipod keeps going on & off showing the battery & then back to the apple nothing else what can i d

    my ipod keeps going on & off showing the battery & then back to the apple nothing else what can i d

    Try:
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    - Also try DFU mode after try recovery mode
    How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
    - If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
    - If still not successful that indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
    Apple Retail Store - Genius Bar
    maybe here too:
    - See:
    iPod touch: Hardware troubleshooting
    - Try another cable
    - Try another charging source
    - Look at the dock connector on the iPod. Look for abnormalities like bent or corroded contacts, cracked or broken plastic.
    - Make an appointment at the Genus Bar of an Apple store.
    Apple Retail Store - Genius Bar

  • When I boot up I get a complete white screen and can't access any thing including task bar. When I right click and hit properties it says it is a Firefox docum

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    Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: Command+Shift+F).
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    If you are in full screen mode then hover the mouse to the top of the screen to make the Navigation Toolbar and Tab bar appear.<br />
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  • When I boot Firefox on my laptop it quickly walks off the right side of the monitor and I cannot interact with the screen, even to pull it back onto the screen

    When I boot Firefox the initial screen comes up but it queickly 'walks' off the right side of the desktop screen, and I cannot locate it to bring it back into view. I recently added a graphics projector and had to change my display values so that the computer would output to the projector. Do I need to change something back. This only happens with Firefox.
    == This happened ==
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    looks like it is not the problem with firefox, ask your husband. through my experience of using firefox there is no poof-off stuff.

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    Here are some suggestions based on my recent issue with unable to get Mavericks up after upgrade - The Apple geniuses just simply couldnt figure this one out...despite it being in their shop for 3 days (They probably did not look at it...and asked if they can just wipe out everything and install fresh...i had said NO):
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  • Ran AHT_All passed.  Still have prohibitory sign and issues upon boot up.

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    Here's what I'd try...
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    3. Click the Erase tab.
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  • Prohibitory Sign and unable to copy items

    I restarted my Mac tonight and was presented with the Prohibitory Sign. I was able to reboot using a backup drive I have and also able to see the contents of my Mac.
    Before I do an Archive and Install, which unfortunately looks like the only option available I wanted to backup some stuff I've been working on since I last backed up (around 5 days ago)
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    I had to take my MBP to the Apple Repair Centre who diagnosed the fault as a blown HD. They replaced it and all works well now.

  • Help replaced a kext file and now I get a Prohibitory Sign and cant startup

    I replaced my iovideo family.kext file trying to fix my non working dvi output. I replaced it with one from my mbp 15 because that one worked fine now I cant start up my mbp17 I get the Prohibitory Sign???

    If you kept a copy of the original file, you can use the terminal to copy it back.
    You should be able to boot into the Leopard DVD using the "C" on boot and get into the single user mode to do this.
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  • Why does my cursor keep disappearing on Firefox (and nothing else) when it's not being moved?

    If I'm not moving the cursor it disappears entirely, which is highly annoying. It only does this on Firefox, nothing else. It went through a permanently flickering period before this, too.

    Thanks for the advice, AmazingBeast - I think that probably would have worked. I isolated the problem eventually to a particular web page I'd been using a lot and had kept open. Once I closed it everything was fine again, although it means whenever I want to look at that page I have to put up with the Disappearing Cursor!

  • HT4061 what does the apple icon mean when its the only thing that appears on the screen

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    That yur iPod is sick
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    How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
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    - If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
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  • My MacBook pro will not start up. when I boot up, it stays on a white screen

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    Reinstall Mountain Lion or Mavericks
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    I have a Mac Book air 11". Normally at home I connect this to a large Thuderbolt Screen. When booting up it some times gets confused and offers me a low resolution result, but some plugging and unplugging of the screen fixes this. I assume it sometimes "sees" the big screen and sets the resolition accordingly. Sometimes does not. But now... I am away from big screen and cannot get the Macbook air on its one to deliver anything other than really poor resolution. I ahve done displays and chosen all three - but no better. And I have said Choose the Best ONe... again not luck. Any ideas. I read in back posts this was a problem a few years ago.

    Welcome to Apple Discussions
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