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Apple's official guide has several good steps. http://support.apple.com/kb/TS1367 I would start with resetting the SMC: the System Management Controller. http://support.apple.com/kb/HT3964 If that doesn't work, reset the NVRAM (which isn't on the list) followed by attempting to boot to internet recovery. NVRAM - Command Option P R Recovery - Command R ...


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I would have liked to comment on the previous answer, because it's a (nearly) perfect description of what to do (at least for the Linux distros I've been working through over the past week), but I'm shy of the 50 rep needed for comments… Anyway, to supplement @danijel-j's answer, I discovered that (some?) of the USB keys I was using required me to ...


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You can't boot a version of OS X older than the version of OS X that shipped with the machine. This is because older versions of OS X do not contain the drivers required to support the newer hardware that it had no knowledge of at the time of development. The boot sequence will freeze on the Apple logo or blue screen and you will not be able to boot.


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Which version of DiskWarrior are you using? On the support page of the website it mentions the following: 10/22/2013 - DiskWarrior 4 version 4.4 Compatible with OS X 10.9 Mavericks The previously released DiskWarrior 4 version 4.4 is required to run an installed copy of DiskWarrior while started from 10.9 Mavericks. If you haven't already done so, you ...


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According to the first answer here, http://superuser.com/questions/383235/create-a-bootable-usb-drive-from-a-dmg-file-on-windows, there's a tool with a free trial called TransMac that can do it. Just make sure the USB drive is formatted with GPT and not MBR. What might be easier, however, is that that model has support for Internet Recovery. If you boot ...


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Try to do a file system check via single user mode. Reboot and immediately press Cmd+S Wait for the command line and then type /sbin/fsck -fy Have a tea. And a cookie. Have a look in the output. If the HDD is failing you might see something like I/O Error. If you see something like ***** FILE SYSTEM WAS MODIFIED ***** then you can try to do it once more. ...


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A verbose boot (Command-v) will tell you where the install is hanging. It'll spew a lot of text, then hang (presumably) on some line. That's where you can start to see what's going wrong. Post that line here and there may be clues. You can try a single user boot (command-s) as well, which skips the UI and drops you to a command line, but that can be ...


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You can't, as your iMac won't let you boot into an OS X version that's older than what it shipped with. Snow Leopard does not have the necessary drivers for the new iMac.


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If the original drives does work in an external case but not internally than patrix has the right idea. We know the old drive is good as it works in an external case We know the SSD does not work at all because it doesn't work internally or in the Mac. In both of those cases drives are not working internally, one known bad and one known good. ...


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When you formatted your drive, you must have been "standing" on some other boot drive ... backup (??). That said, clone its OS to your newly formatted drive. Use Carbon Copy Cloner ... the best. If you don't already have CCC, get it and install it on the drive where you "stood" to do your original formatting.


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Could you swap hdd cable and see If that help ? Also take a look here: https://discussions.apple.com/thread/2648100?tstart=0


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I found out that my problem was due to a failing sata cable. Since I have replaced it, I do not have this problem anymore.


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-What happens if you take the memory out and replace it with the original RAM? Does it work? -Have you tried re-seating the RAM? (e.g. take it out and put it in again, making sure it's fitting in the slots properly, and also making sure there's no dust on the RAM or in the slots...) -Is the RAM PC5300 DDR2 ECC? -Have you tried resetting the SMU? ...


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Based on the fact that you're stuck at the Apple logo, it actually sounds like you're stuck at boot-up instead of being in recovery mode! It's likely that a tweak you installed caused it to enter what is often called a "boot-loop" when you restarted it. To exit this, try holding the power and home button for ten seconds like you saw in those guides, but ...


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I suggest you test the installed memory. Do it once or twice a day until your Mac freezes up. Go here: http://osxdaily.com/2011/05/03/memtest-mac-ram-test/ Click on Download MemTest now (direct download link) Run that installer package. Launch Terminal (Command-Spacebar and type Terminal) Enter memtest all 2 (Runs tests twice; Change number for more or ...


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It sounds like the hard disk may have been damaged, or perhaps its connector has become disconnected. If you can dismantle it, try disconnecting the hard disk and reconnecting it. If that makes no difference, then it sounds like you need a new hard disk (or even an SSD). Installing is possible from a USB stick, so you don't need to use the DVD drive. But ...


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I have the same issue as you. It is a GPU failure. I have a solution for that which is I am using. First reset the PRAM. It will boot with waves on the screen. The screen will go grey with no Apple logo. It will shutdown itself after sometime. Boot now and it will work. Download a software called gfxCardStatus. Change the GPU to Intel HD. Never use Flash or ...



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