I am trying to use my iMac as a display for my Macbook Pro. Here are the specs of each:
iMac: 21.5 inch, late 2013, OS X 10.9.5.
Macbook Pro: 13 inch, mid 2012, OS X Yosemite 10.10.2.
In theory, target display mode should work, since both computers have Thunderbolt ports, and I am using an Apple Thunderbolt cable (0.5m). Nothing happens when I press Cmd-F2 on the iMac (using an Apple keyboard - some people have reported problems with non Apple keyboards).
I think there might be a problem with the Thunderbolt bus. On the Macbook Pro, the Thunderbolt Bus report (in the System Information app) says
Port:
Status: Device connected
Link status: 0x2
Receptacle: 1
Port Micro Firmware Version: 2.1.3
Cable Firmware Version: 1.0.16
Cable serial number: C4M3...
But on the iMac, the Thunderbolt Bus report is
Port:
Status: No device connected
Link Status: 0x7
Receptacle: 1
Link Controller Firmware Version: 0.12.3
Port:
Status: No device connected
Link Status: 0x2
Receptacle: 2
Cable Firmware Version: 1.0.16
Cable Serial Number: C4M342301U8FQ7MA5
Link Controller Firmware Version: 0.12.3
It seems like both computers know that a cable is attached, but on the iMac it can't detect a 'device'. Any advice?
