Solution for sleep issues with external display?
I had an Early 2011 Macbook Pro that worked quite well with an external display. I now have a Mid 2012 Macbook Pro (bought 5 days ago, and running 10.10.3) that will not consistently work with the same external monitor.
I had it working yesterday for a few hours only if I left the MBP with the top open (both the MBP screen and external monitor stayed lit). But, today it is back to freezing each time the monitor is connected to it.
I have tried:
1. Connecting the external monitor to the MBP with the top open. Results in the MBP screen now going dark and no signal being passed to the external monitor. If the external monitor is disconnected, the MBP screens stays dark and the computer is unresponsive requiring a hard restart.
2. Connecting the external monitor to the MBP with the top closed. Results in no signal being sent to the external monitor. Disconnecting the external monitor and reopening the MBP yields, again, and unresponsive computer which requires a hard restart.
I have tried three different external monitors, all giving the same result. The MBP is connect to external power, and I am running the latest OS (10.10.3).
Any suggestions before I return this to the Apple store in a rage? :-)