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Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac13,2

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Does not boot off mountain lion usb bootable drive

So I have created a mountain lion USB boot drive because I work on a number of imacs, but for the latest generation it doesn't seem to work.

I create it in the normal way, downloading the app through itunes then using http://liondiskmaker.com/ to create the usb boot drive.

When I try to boot from it: http://i.imgur.com/IUDlv.jpg

I get this icon on the screen: http://i.imgur.com/DNc8U.jpg

The weird thing is that I have used this exact bootable usb stick to upgrade many, many older imacs to mountain lion. I don't want to have to redownload the entire 5gb or so every time I need to install mountain lion on a new imac. I've tried this with both the 21.5" and the 27" varieties and both have the same issue. What is causing this?

I also need to boot from it directly rather then doing an in-OS upgrade in the odd times I'm working with an imac that is not bootable or has a bad hard-drive.

Answer this question I have this problem too

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Macs will not boot from a system that is lower than what it shipped with. The newer machines probably have a higher system version than what you are trying to install. The late 2012 iMacs shipped with 10.8.2.

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That's plausible. I'll redownload the latest version with the updates and see if I have the same issue after the weekend.

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I'm encountering a similar issue - however, I'm having the problem with an old (pre-2009) white Macbook. Any thoughts?

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