Cannot boot from USB drive!!!!!!!!!!!!!

Hi
I have 3-4 120Gb 2.5inch drives which I clone my MacBook Pro to on rotation.
I have always been able to boot from these drives UNTIL NOW!
Suddenly I can no longer boot from them, the boot process starts and gets well through and then the drives all seem to just 'hang'.
The only significant change is that a local Apple support company upgraded my stock 120gb drive to a 160Gb drive.
Any ideas what the issue coiuld be?
Cheers.
Robin

Hi robster,
If the USB drive contains a valid OS you should be able to verify and repair the permissions on that drive, give that a try.
Also i suggest running DiskWarrior 4 on it.
The replaced internal drive should have no effect on this unless some settings got changed when the new OS got installed on it that now prevents the mac from being able to read your USB drive.
Does the USB drive need a driver ? if so is the latest version of that driver properly installed ?
If the USB drive checks out and all is OK maybe a re-install of the OS on your internal drive would help.
For now try disk utility and diskwarrior if you can that could narrow things down

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