Won't show external monitor after updating to 10.9.2

Late model 2012 macbook pro (non-retina) won't connect to external monitor after updating to 10.9.2 Tried PRAM, cleaning preferences; in safe mode the monitor does show up, but how does that help me?
Bob

I have the same problem with my mid 2012 mbp, but I can get the external monitor to show if I dont using the mirroring feature. Not exactly what I want to use but it may help if no one can find a solution.

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IMac always auto detects for external monitors after waking from sleep or from display off

I've got a Dell 24" monitor (2408WFP) plugged into my mid 2011 iMac via DVI cord and thunderbolt attachment. Things work fine.
When I need to leave my computer, I usually turn the displays off using the shortcut keys: CTRL + SHIFT + EJECT
This works perfectly and both displays go black. However, when I return to my computer and reactivate the iMac, the iMac display will turn blue as if I have just plugged in a new monitor even the external monitor is still plugged in. It usually flashes blue twice before displaying the password prompt. I can usually just log back in as normal. I've never had this happen before using Snow Leopard. It's annoying but strange.
However, even more strange is that sometimes when returning to the desktop, the iMac will do the auto detect display thing and then when I log back in, the external display just shows static as if there is no signal. I've checked the cable a million times and everything is as tight as tight can be and both ends are plugged in properly. Unplugging the displayport adapter from the iMac and then reattaching it restores the desktop on the secondary display although sometimes, it results in the secondary display showing a gray background picture instead of my normal picture. Replugging the secondary display seems to fix that too although sometimes it doesn't.
Why is this happening?
- Problem with the adapter?
- Problem with the DVI cable I'm using?
- Compatibility issues with my external monitor?
I need to stress the point that this has never happened before with Snow Leopard.
If I am the only one experiencing this then I suppose it may be an issue with the iMac or adapter or even the cable. But if anyone else can shed light on this problem, I'd really appreciate it.

Hi Micheal,
I've been experiencing the exact same issue with my new iMac I just bought. I bought it refurb so I wasn't sure if it was a defect with the hardware or not. Since I'm not the only one I will asume it's not for now.
Setup:
- iMac 27-inch 3.4GHz (Release May 2011)
- Dell 2709W external monitor
- Hooked in with mini display port to DVI adapter
- Lion 10.7.3 all up to date to this day
From what I've been able to gather the issue presents itself only when my Dell 2709W enters "Power Save Mode" after I do CTRL + SHIFT + EJECT or when the diplays simply goes to sleep by themselves.
Although if I hit that combination and the displays goes to sleep but I don't wait long enough for my Dell monitor to actually "Power Save Mode" (wait like 2 sec) then touch the keyboard then the 2 displays (iMac and Dell) resumes from sleep without the issue presenting itself.
I'm tempted to buy the mini-display port to HDMI just to see if the issue is still present with that adapter. If I do I'll update my post with the outcome.
If anyone else has any info to help with this issue it would be greatly appreciated. It's very annoying when you resume from sleep and you find all of your windows that where opened on the external display before sleep squeezed into your main display (iMac).
Thanks!

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I have a ThinkPad T410 with Windows XP SP3. I've installed the latest Presentation Director (4.55) and the latest Intel HD drivers (6.14.10.5273). If I hook up my external LCD monitor (an HP L2045w) directly from the VGA port on the monitor to the VGA port on the laptop, I can extend my video display to this monitor. However, if I attach the monitor through a KVM switch (a Belkin Omniview E series), I can't. I don't have a dock for this laptop.
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I'm having exactly the same problem.. I'm thinking it might be a power issue (the power adapter for the omniview series was optional) - but I've never seen this before, and I'm seeing other external monitor issues crop up... let me know if you find a solution.
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No they haven't worked on this computer before. I using them on my old MacBook Pro (a computer which is no longer working) which ran Snow Leopard.
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Hi,
i`m using the Satellite L500-120 Notebook, and before installing Windows 7 the laptop had a very comfortable function, when i applied an external display.
When i closed the lid of my notebook, the desktop was shown on my external display (with the native resolution of the external display), so i didn`t have to
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Hi
Im not a Windows 7 user because I will wait until it will be released offical but I hope I can help you a little bit:
First of all in Power Management you can choose the action what happens if you close the Lid (e. g. sleep, turn off, etc.). This action should be disabled because otherwise the notebook will shut down or something else.
Then I think you have to install the display driver for your notebook. You can try the Vista driver because the most of them are work on Windows 7.
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A working display driver is important for clone or extends monitors so check this!!

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I recently had my Macbook Pro 13in upgraded to run OS X 10.6.3. Subsequently I have been unable to use my external BenQ G2420HD external monitor at it's full resolution. I'm using a MiniDisplayPort to VGA (D-Sub) adaptor. I have the latest firmware for the adaptor.
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http://support.apple.com/kb/HT3964

Won't show external monitor after updating to 10.9.2

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