Boot camp shows 'no bootable device...' on restart

Hi, have had my new Imac a week or so, late 2013 Intel based with new OS etc, working fine with the OS so decided to install Win7 using boot camp.
The system in OS went fine, downloaded the drivers etc onto a USB stick, started the boot camp software, the Imac restarted but is hung at 'No bootable device--- insert boot disk and press any key' now the stupid amongst us would ask where the 'any key' is but you have probably heard that one before.
I cannot reload Mac OS either, unless there is a secret key stroke sequence out there , is there ?
I have an external drive which has been working fine for some time, a win7 64bit disc, which when inserted into the exetrnal dvd drieve does nothing, it flashes a couple of times but comes back with the same message.
Good job I kept my trusty old Pc so I could post this
Please help before I lose my sense of humour.
Thanks
Eric

Remove all external devices when you try to boot. The system does not know which device to boot from when you have multiple devices (usb stick, external drive, etc.) attached. You only attach the device required for the specific step of the Boot Camp process you are currently performing.
To boot back into OSx the key sequence is to press and hold the option key when powering up the computer. You can set the default boot OS after you get Windows working.

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First - Burn recovery media before you make any changes! -you may want or need to go back to windows 8 later-
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StinkPony wrote:
/dev/sda2 / ext4 50G
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https://wiki.archlinux.org/index.php/Be … bootloader
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Boot camp shows 'no bootable device...' on restart

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