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Hold down c key wont boot from disk

Get a question mark symbol

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If your OS disk is a DVD, and you have a CD-ROM installed, it's unreadable by the internal drive. You'll need to get an external Firewire DVD drive. Connect it, make sure it has power, then hold down the option key when you turn on the iMac. You may have to wait a bit for the DVD to read out, but you should see the DVD icon show up on the display. Select it (you may need to use the arrow keys), then press return to boot from that drive.
A flashing question mark with no readable optical disk installed says either the operating system on the hard drive is corrupted or the hard drive is bad.

Posted on Feb 17, 2012

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Try restarting and holding down the command and C keys at startup. This should eject the disk. If that doesn't work, restart with the mouse button held down. This is also to eject the CD. If it doesn't boot correctly after the CD is out, restart holding command, option, O and F. This should bring up an open firmware command prompt screen. Type in "reset-all", without the quotation marks, and press enter. This will restore the PRAM and NVRAM to factory defaults and should allow normal booting. It may take a bit longer to boot the first time after you do this.

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When I turn on my computer I get a grey screen for a few minutes until a blinking folder with a question mark in it appears. Often, my computer shuts off after the question mark folder disappears. I have...


The blinking question mark means that you macintosh can't find a bootable disk. It has nothing to do with the VGA connection. More than likely, your directory structure on the disk is bad. An excellent product to fix this is Disk Warrior. It has saved more hard drives for me than I care to think about. Worth every penny.
As far as booting up from a disk, just put in the CD and hold down the C key until you see the spinning icon.
You could also try these to things if you don't want to purchase disk warrior, but I don't think they will work. Hold down the shift key while you boot until you see the apple logo. The shift key is to boot it in safeboot mode. Or, you could also reset the pram:
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  2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
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good luck and best wishes P.S.-don't forget to rate me

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