Intel Mac :: Unable To Boot When USB 3 Drive Attached

Apr 23, 2012

I have a 2TB Hitachi  Backup drive, and a 1TB Verbatim Portable drive, both are USB 3, and when they are connected and the iMac is switched off, it will not boot until I remove the drive. 

How can I leave the 2TB drive connected and power up the iMac ? 

The 2TB drive was purchased to be a Time Machine backup drive. 

Info:
iMac, Mac OS X (10.7.3), 3.4GHz Intel Core i7 - 8GB

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Last week I bought a new Fantom external hard drive (1.5TBs) and discovered the same exact issue, with one exception... the Fantom will boot the Macbook Pro via USB 2.0, but only when plugged into the left side port.  

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Info:
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Info:
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Info:
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I have made sure my Mac hard drive is the main one which it is, i formatted it and also repaired it and nothing is working.  

I have an HP and a Seagate external hard drive hooked up to my mac also and the Verbatim is the one that gives me the issue so I dont know whats happening..

Info:
iMac 21.5" + Macbook White Unibody 13" + iPhone 4

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Info:
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Info:
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