I purchased a used Mid 2012 MBP on eBay and it arrived in the mail yesterday afternoon. My previous main computer was a Late 2009 MBP that I had upgraded to have a 128 GB SSD as the primary drive and placed a 500 GB HDD in the optical bay. I asked a few friends what to do and was given an answer of "Just move the drives over and it should work"... so I moved the drives over and the bluetooth and airport both showed as not working. I was worried that I had damaged the airport/bluetooth connectors or card during the installation of the optical bay drive, so I re-checked the connectors, rebooted and the bluetooth worked but the airport shows as "No Hardware Installed". After this I ran an Ethernet connected Apple Hardware Test and got an error of "4SNS/1/40000001:VPOR-0.000". This seems to indicate that a sensor on the logic board is malfunctioning. All research shows that this is likely unrelated... but it's still a cause for concern. That aside, I continued. I tried a PRAM reset, and the bluetooth began working, the OS recognised the airport but showed it as OFF. It would not turn on. After that a friend suggested that I run a Combined System Update. I did that and the next time I booted both the bluetooth and the Wi-Fi worked without issue. I then ran the AHT just to see if somehow this resolved the error, but it didn't... however when I restarted after the test the bluetooth was still working but the airport was not. Just to check I reconnected the original HDD that came with the 2012 MBP and both suddenly everything works again. Questions: 1. How do I get everything working using the installed SSD/HDD combo? 2. If that proves to be a pain, or not worth the effort, how do I migrate a SSD/HDD combo?