I'd start with System Information app in your Utilities folder. Launch that and then find the System Report button and action that. In the System Report there are a couple sections, one called Hardware and under Hardware is Thunderbolt. Select that, stop interacting and then VO-right twice to get to the details about the Thunderbolt Bus. In there under Port should be info about whatever devices it found. I don't have any so mine just says "No device connected". If yours says the same and the device IS connected then there is some kind of hardware issue which no amount of software twiddling is going to resolve.

CB

On 9/8/14, 3:43 PM, jeff `greene wrote:
Hi listers, I have a 2012 MBP I bought on ebay. I have a Lacie
external hard drive that will connect with thunderbolt or usb. It
doesn't show up on the finder using thunderbolt. Is there any test on
the mac to determine if the problem is with my mac or with the
external drive?
Thanks, Jeff


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