Lid closed with targetted display mode issue

[sfwalter]

Hi,

I'm trying to use my late 2009 iMac as a display for my 2011 Macbook Pro via display port-display port cable. It works fine when I have the lid open on my Macbook Pro. However when I close the lid the iMac display goes off after a few seconds.

It seems like the Macbook Pro is going to sleep. Any ideas on how to prevent this. I have a wired keyboard and mouse connected to the Macbook Pro but the external display still goes to sleep.

Any ideas on why this is happening?

 

[tillsbury]

Same here, using DP monitor, USB keyboard and mouse, screen goes blue when I shut the lid, but on reopening the display reappears but OSX crashes such that I need to hard power-off (holding the power button down) to recover. Can the MBPr not cope with running when it's shut?