FireWire and does not recognize external drive.

I am running a Macbook Pro 10.7.5 2010. Recently my firewire port started reading randomly my WD external hard drive. When I plug it in, the light comes on to show it is powered, but no other Exchange of information is performed. It does not appear in the Finder or disk utility. While he will reveal sometimes without reason. Any ideas?

It could be the port, the cable or the housing.  Test all three possibilities.

As a matter of procedure, reset the SMC and the NVRAM:

https://support.Apple.com/en-us/HT201295

https://support.Apple.com/en-us/HT204063

Ciao.

Tags: Notebooks

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