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According to this page on EveryMac.com the resolutions you want to run should be supported. The problem might be the adaptor. I would try a PRAM reset (restart while holding down Command-Option-P-R), or possibly an SMC reset, detailed in Apple's Support system. If these don't work, I'd try a different adaptor. Good Luck.


I am new to Mac and have experience both these issues, I hopefully can shed some light on the first question, but have not yet found an answer to question 2. To turn off TDM on my late 2013 iMac (connected to a late 2011 macbook pro) I have to type in my iMac password followed by cmd +F2 - its a bit of hit and miss, but it is the only way I can get TDM to ...

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