Q: External monitor stopped working after 10.9.2 update installation
I've been using a Dell U2712H display for about a year with a mini-display port to display port cable.
However, after installing the 10.9.2 update, the monitor is going into sleep mode when connected to the MacBook Pro (as it doesn't think it's getting a signal), even though the laptop thinks it's correctly connected. (If I turn the monitor off, the menu bar, etc. revert to the MBP screen.)
About the only related Mavericks default I've changed is to disable the "Displays have seperate Spaces" option within Mission Control, although I've tried re-enabling this and logging off/on again to no avail.
I've also tried resetting the NVRAM and the SMC, neither of which appear to have made any difference.
MacBook Pro (15-inch Mid 2010), OS X Mavericks (10.9.2)
Posted on Feb 25, 2014 2:16 PM
I've managed to get my monitor working again.
It's actually a Dell U2713H (the "2712" was a typo in my original post), and I had to disable DisplayPort 1.2 support within the OSD to get it to work again.
To do this, you might need to use a bit of a workaround, which is to get the monitor to bring up the input select and then hold down the green tick for ~8 seconds when the (mini-)DisplayPort option is selected. This will bring up a new menu that enables you to enable/disable DisplayPort 1.2 mode. (Green tick to enable/red to disable.)
Posted on Feb 27, 2014 12:53 PM

