My iMac can't boot Windows 7 From USB while my Macbook Pro can do it

I install Windows 7 64 bit and rEFIt into a USB hard disk and hope to boot from my iMac 27" (2010 Mid). However, it shows that no boot deivce is found.
If I plug the SAME disk to my Macbook Pro 17" (2009 Mid), it can boot Windows 7 without any problem.
I tried with Linux and get same result, iMac says no boot device while my Macbook Pro can boot it without problem.
I tried experiment for weeks and still can't get iMac work.
I think it is very abnormal and I wonder if someone can tell me how to fix it or any directory to solve this problem.

My iMac runs snow leopard and my MacBook pro runs Lion. Both of them are updated with latest updated. I just get one external USB hard disk with Windows 7 32 bit installed and magically, my iMac can boot it from rEFIt. However, I don't know what makes it works. I tried to make same configuration, software and steps on other USB hard disks for hundreds times but I can repeat it again. All other attempt can make USB hard disk boot on MacBook Pro but not iMac only.

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Clinton

Can you run windows via bootcamp on the macbook pro retina display 2.5GHz dual-core Intel Core i5 512GB flash storage1

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How can I boot linux from usb drive and/or dvd drive on a windows 8 laptop please?

Hi all,
Could someone describe how to set my windows 8 laptop to boot linux from usb and or dvd drive step by step please? I have HP laptop. Thank you.

http://www.cisco.com/en/US/prod/collateral/modules/ps6247/prod_qas0900aecd80232483.html
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     A. USB Flash sticks are supported in 64, 128, and 256 MB sizes. No other sizes are supported.
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HI all:
I recently had a motherboard failure on an existing PC on which I dual-booted Windows XP and Gentoo. I replaced that box with a new HP PC preloaded with Vista. Wiped that immediately, and installed ARCH. But, I would like to also boot XP, and, since my old hard drive is still OK (I have it in an external USB adapter), I was thinking that I might configure grub to point at an external USB drive like this:
# Windows XP
title Windows XP
root (hd1,0)
makeactive
chainloader +1
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-dvh

dvh wrote:
I configured as shown in the wiki, but when I try to boot XP, I get a message that says something to the effect of "missing or corrupted <windows root>\system32\ntoskrnl.exe". I checked the disk and it seems to be there and OK. I get the feeling that it is either NOT finding the hard disk (or partition) or it cannot interpret the NTFS file system (but grub was able to boot this before,...). So, two questions...
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2) does the target disk NEED a windows boot loader? as I said earlier, I used to dual boot it, so there is a grub loader on that disk also.
...ok, three questions...
3) anything else that I should consider??
Thanks again for any help.
-dvh
1) i don'tknow a way to check this, but the
missing or corrupted <windows root>\system32\ntoskrnl.exe message comes from the windows boot process,
so it seems grub is configured correctly.
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Windows takes the settings for boot from the boot.ini file in the root of C:\ , and that probably needs to be changed.
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Serial Serveur » Lion DiskMaker (US)
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I'm really hoping someone can help me shed some light on this subject as I feel like I have tried completely everything.
Thanks in advance,
Todd

Take your MBP to an Apple store genius bar for a free diagnostic examination. Since these symptoms are 'regular' and not intermittent, they should be able to determine what the problem is and the cure.
ciao.

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Check your Network control panel and turn off Auto-Proxy setting.
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See mount section. You can run this from Terminal in Recovery.
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Welcome to Apple Support Communities
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My iMac can't boot Windows 7 From USB while my Macbook Pro can do it

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