My iMac won't boot....Msg says "NO BOOTABLE DEVICE--INSERT BOOT DISK ...

I don't know how to start my iMac up. I don't even know what a boot disk is! Several days ago I tried to run Boot Camp but couldn't continue because I didn't have a Windows program to install si I'm not sure what happened. Can somebody please help me out? Thanks.
Dman- [email protected]

My iMac won't boot....Msg says "NO BOOTABLE DEVICE--INSERT BOOT DISK ...
Posted: Jan 17, 2011 11:44 AM
I'm getting this message again. When I restart using the option key everything is ok. When the computer goes to sleep it has the above message. Is there a setting I need to turn off so this doesn't happen all the time? Thanks.
Dennis

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Hello there!
I recently upgraded my imac mid 2010 system with a SSD hard-drive. The old "main" drive went to the place of super-drive and after reinstalling OS X into the new drive and wiping the old drive a very interesting problem happened. I started trying to install windows 7 via bootcamp. I did everything what the bootcamp assistant says and after the imac restarts itself it just says No bootable device -- insert boot disk and press any key. Firstly I thought that maybe something is wrong with the installation disk (i have an external super-drive connected to the imac). After restarting the imac once again i held down the option button and arrived to the screen, where it shows the avlaible boot options (different disks). Now, what I saw, was funny. The bootcamp assistant had'nt created the bootcamp drive at all. Atleast it did not show it. After doing this two-three times the result was the same. My next idea was that maybe, there is an issue with the concrete SSD model I am using. So I went back to OS X and opened the bootcamp assistant and restored the state of the OS X SSD drive. Next I did an bootcamp partition onto the old drive I have installed. But the result is still the same. Now my head is empty of ideas.
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Hi Michael!
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If you didin´t understand anything or something doesen´t add up, send me a letter or a notification.
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Hello there!
I recently upgraded my imac mid 2010 system with a SSD hard-drive. The old "main" drive went to the place of super-drive and after reinstalling OS X into the new drive and wiping the old drive a very interesting problem happened. I started trying to install windows 7 via bootcamp. I did everything what the bootcamp assistant says and after the imac restarts itself it just says No bootable device -- insert boot disk and press any key. Firstly I thought that maybe something is wrong with the installation disk (i have an external super-drive connected to the imac). After restarting the imac once again i held down the option button and arrived to the screen, where it shows the avlaible boot options (different disks). Now, what I saw, was funny. The bootcamp assistant had'nt created the bootcamp drive at all. Atleast it did not show it. After doing this two-three times the result was the same. My next idea was that maybe, there is an issue with the concrete SSD model I am using. So I went back to OS X and opened the bootcamp assistant and restored the state of the OS X SSD drive. Next I did an bootcamp partition onto the old drive I have installed. But the result is still the same. Now my head is empty of ideas.
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The Windows 7 CD I use is actually a burned one. My University is a member of the msdn academic alliance and therefore offers me to download microsoft software for my work. I stress out that this is absolutly legal, I will only be allowed to use the software unitl I finished my studyings.
Apple Disk Utility won't do a proper job and won't work (and it varies, some can start the install but fails later) Has to be burned at 2X Reduced Burn Speed
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Apple Boot Camp Support

White screen and message reading "No bootable device--insert boot disk and press any key"

My iMac was recently upgraded to the new Lion software. I dont know if that has anything to do with it but, the computer was working fine. I was working in iMovie, had Safari open. My cousins and I opened Photo Booth and started taking pictures. When we clicked on effects and selected an effect everything froze. I turned off the computer and when it started up, the screen was white. I unpluged it and restarted it, same thing. I unplugged it and around 3 hours later I turned it back on...same thing! Well this time after the white screen appears for I dont know...10 15 seconds..it goes black and a message saying "No bootable device -- insert boot disk and press any key" appears. I have no idea what to do. I have stuff that needs to get done that is saved on this computer. PLEEAASSEE HEELLPP!!!!

Start up you computer holding down the option and select Macintosh HD (or whatever name you gave your OS drive). If successful, take a trip to System Preferences->Startup Disk and make sure the proper HD is selected. Hope this helps.

No bootable device -- insert boot disk and press any key, over and over again...

I've seen a lot of discussions about "no bootable device -- insert boot disk and press any key" but the answers in them don't seem to help me at all.
from the begining...
i was tryin to instal windows 7 on my 2014 iMac and after bootcamp prepared the iso on a flash drive, the computer restarted in the windows instalation screen and i chose the "BOOTCAMP" partition.
After thi i got an error with a mesage that the partition wans not in ntfs, and a question if i wanted to format it. As i am recent to OSX but i was a windows user for quite a while i thought, ok there should be no problem about letting windows format this BOOTCAMP partition so i went ahead and did it. after this i stopped the process because at the moment i seem to recal that in the mac osx bootcamp help there was something about making sure to installing windows to the BOOTCAMP partition. So i canceled the process and restarted the iMac.
Now i get the "no bootable device -- insert boot disk and press any key" message over and over.
I've tryed restarting with alt, alt+cmd+p+r, alt+r, etc and allways get the same message.
Just before tryin to install windows on a secondary partition had the iMac backup to an external drive on my airport express via time machine.
Questions.
are there any other ways to boot into OSX again, or after letting windows format the BOOTCAMP partition all is lost?
If everything is lost, how do i boot to restore my time machine backup from the external drive?
all help is apreciated.
Thanks in advance

Sorry about that I just realized that Boot Camp may have decompressed your ISO, We can't really do much because Boot Camp may have told the mac to boot from the flash drive, but now your mac is most likely not being told to boot from it. (You where able to boot from the drive before so I would keep it all intact) Is your keyboard wireless (because it can cause your mac to not to register keys being pushed at the Macs start) which this may be preventing you from getting into recovery mode (Command-R) or the OS choosing screen (Option).

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I have a C650D that was working fine up to a week ago.
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EDIT:
I just tried booting from the usb drive with the harddrive removed from the system and the boot process continues normally. If I try & boot from the internal dvd drive though it still fails to see any disk.........

> I just tried booting from the usb drive with the harddrive removed from the system and the boot process continues normally. If I try & boot from the internal dvd drive though it still fails to see any disk.........
Does this mean that if you remove the HDD you can boot from the USB flash drive, but you cannot boot from CD/DVD drive even if the HDD is removed?
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When I turn on my iMac, it shows a black screen and says 'No bootable device - enter boot cd and press any key'. Not sure how to fix this.

When I turn on my iMac, it shows a black screen and says 'No bootable device - enter boot cd and press any key'.
I'm not sure what to do, I did not recieve a cd with my mac to boot it up (I ordered it online).
Also I can't find my harware serial number (I've tried many times to input what I thought it may be from my receipt). I saw that I need this number to contact apple support, my 90 day complimentary support is still valid so I wish to contact them.
I don't know much about apple products as this is my first apple computer so any information is helpful.

Hold down the Alt/Option-key at startup of your iMac to get the Boot Selection screen.
From that choose to boot into OSX.
Once in OSX go to System Preferences then Startup Volume and reset your OSX to be the default.
The new iMacs have OSX 10.7 Lion preinstalled and don't come with any CD/DVD anymore.
Instead OSX Lion includes a new feature called "Lion Recovery".
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No Bootable device insert boot disk on iMac Wireless

Hi,
We just recently bought an iMac with Intel just a month ago. Earlier today my computer completely froze so I restarted it. When I turned it on. I received the "No Bootable device--insert boot disk and press any key". Well with the new computers, we did not receive a disk and there is no disk drive in the machine. I have an external disk drive and I unfortunately do not have an external hard drive either. I have most of the files saved on a separate computer.
I looked online and saw that when you restart the computer you can hold the Option key and it will bring up all the systems. It does work and it gives me two options. One is the windows and the other one is a hard drive but its not the OSX hard drive. I've tried both and they both do not work and send me back to the message "No Bootable device--insert boot disk and press any key". We just bought it less than a month ago and I also have a 3 year support and coverage on it that covers problems if need be but I would like to try and fix it myself.
If anyone has any other ideas or tips please let me know.

OK. That's not the best news. I can take you through some Terminal commands to attempt to mount the volume if that's possible. Or, you can just erase the volume and reinstall OS X. I suppose your choice here depends on whether you have backups of your files.
Install or Reinstall Mavericks, Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
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4. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion, Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
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My iMac won't boot....Msg says "NO BOOTABLE DEVICE--INSERT BOOT DISK ...

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