Intel Mac :: USB Hard Drive Will NOT Allow To Boot?

Jan 31, 2012

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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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Gray screen and 'prohibited' logo appeared today without apparent reason.Forced a power down by holding power button. Restarted....eventually reached user login screen but froze again on login attempt after password entered.

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have disconnected peripherals; reset smu, smc, and pram;

safe boot w shift key did nothing;  

safe boot shift+v produced a screen of text that got as far as com.apple.launchd 1

but then several lines of text appeared repeating twice eaxctly same, each headed by disk0s2: I/O error. with [ErrNo 5], then

dyld: Library not loaded:   and Reason: no suitable image found

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I have tried installing from the original install disk several times but holding C key or Option/Alt key or D key gets no response and I cannot get the install disk to eject either holding down mouse button, eject button 

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Is this a dead hard drive or does someone have other suggestions that might work?

Info:
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