Thunderbolt port broken or faulty cable?

Hello!
I have a 27in 2.7 GHz Intel Core i5 mid-2011 iMac.
I bought a LaCie 1TB rugged thunderbolt drive a while back and when I went to plug it in, the thunderbolt didn't work (for both ports). I called Apple and they walked me through the steps and it still didn't work.
The thought just popped into my head that it could just be the cable. If both ports are not working, is it most likely the cable? I went into System Information and for both ports it just says "No devices connected". Unfortunately, I don't have another cable and at the same time, I'd like to avoid taking it in.
So I'm just wondering if it's unlikely that both ports wouldn't be working and that it's probably the cable.
Cheers!
Kris

The chances of both ports being bad is slim but not zero. It could also be something else in the Mac that is causing this.
It could also be the drive.
The only way to test this is to try a  different cable and /or device. If you don't have another cable and can't get one then bringing it into Apple is your best course of action.
regards

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