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DZ77RE-75K Thunderbolt Doesn't Seem to be Working

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I've plugged in an Apple Thunderbolt Display and an Apple Thunderbolt to Gigabit Ethernet Adapter, and neither work, even after a reboot. Is there a way to test if the port is active/functional besides simply plugging hardware in?

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I'm having intermittent success w/ Thunderbolt. I'm using v49 BIOS on a DZ77RE-75K mobo w/ a Xeon E3-1270 processor. Having USB issues w/later BIOS revisions, so I haven't updated.

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