3 Replies Latest reply: Dec 12, 2012 8:25 AM by Cosman
Cosman Level 1 Level 1 (10 points)

Ever since I got a new MBP with the new thunderbolt port, any monitor I hook up to the port will turn on and off repeatedly for several minutes before becoming stable.  The monitor may turn off later, but usually stays stable after it has been connecteda while.


The monitor will drop out, showing the "no signal" text, then even going down to sleep mode (green light turns to yellow).


I took the MBP into the genuis bar and they diagnosed a bad mother board.  After it was replaced, the problem stayed the same, so it is not the mother board.


I thought it might be the thunderbolt adapter, but I have two of them and the problem occurs on three different monitors with either ofthe adapters.


The MBP screen is not affected.



MacBook Pro, Mac OS X (10.7.3), I7, 8GB, 750GB, Lion