I am wondering if this is possible..... I had a problem with 2 OWC FW drives not working on my 2011 iMac. After going round n' round with OWC for replacement (they were new) I decided to give Apple a shout. (All my other FW drives worked fine, just not the OWC). I showed them the problem. Since I still had AC and they couldn't find anything, they replaced the logic board. Same outcome, I left it alone and trashed the OWC's, as they would only do USB2. That said to ask this. Later I tried a Thunderbolt drive and it didn't work for me. Is it realistic that maybe the port was dead or just an incompatible drive?