Yosemite: Turning off Macbook Pro screen (lid open) with external monitor connected

Here we go again, this worked pre-Yosemite. Now it seems this trick no longer works. After following these steps again the screen on my Macbook Pro now turns on after logging in and opening the clam shell.
Anyone figure out/know a way to turn off the screen on the Macbook Pro with external monitors plugged in? (yes, closing the clam shell–but I'm referring to keeping the clam shell open with the display turned off)
http://gizmodo.com/5938452/a-trick-to-make-using-an-external-monitor-with-your-m acbook-way-better
To execute in Terminal:
sudo nvram boot-args="iog=0x0"
To undo in Terminal:
sudo nvram -d boot-args
Once you type it into terminal I believe you need to enter your password. I then restart my machine. Now the TRICK is to either restart your machine with the lid already closed (hit restart then slam the lid!) OR turn the machine on for the first time (then quickly slam the lid!) once you are past the login screen you can open the lid.

Has anyone experimented with tip 2 (active corners)? Perhaps it still works.
http://www.cultofmac.com/176329/turn-off-internal-lcd-display-of-your-macbook-ai r-os-x-tips/
Κοσμά τι λες; Τα έχεις μπερδέψει. Άλλο συζητάμε εδώ. Το ότι δεν μπορείς πια να δουλεύεις μόνο με την εξωτερική οθόνη (να έχεις σβηστή την ενσωματωμένη οθόνη όταν έχεις συνδεμένη εξωτερική).

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Long story short I have a Macbook Pro older version like 2007-08. The screen is broken and I cannot seem to get it to hook up to an external monitor. I've tried booting it up and holding cmd + F1, Nothing. I've tried booting it up and shutting the screen and using an external mouse to try and wake up the external monitor, nothing.
Heres 3 things that I can imagine are going wrong.
1) My external mouse is garbage and doesn't work.
2) I need an external mouse and keyboard.
3) I use to run Windows 7 on the computer as well. So whenever I booted my computer on i would have to hold the option key or it would go directly to windows. When I held the option key it would show 2 hard drives the mac and the windows, then I would have to click the Mac hard drive in order for it to bring me to the Mac login screen.
I'm thinking I might have to be at the mac login screen in order to do anything?
But I'm not sure.
I've been trying to guesss my way around with the track pad to try and click the mac harddrive logo (After holding option) but I can't seem to get it.
Is there ANY other way to get this to work. I replaced my mac lcd about a year ago and not it is black again for some reason. I took it apart today and tried unplugging anf plugging everything in again but it still doesn't work. So I really want this external monitor to work.
Guess that wasn't to short of a story!!
Thanks,
Anthony

If an external display doesn't work, its possible your video card is shot or the connector is bad. The Mac Pro's video card is pretty easy to replace. If you have the Apple display I think there are some diagnostic lights that flash when something is wrong with the display itself.
You are talking about a "headless" Mac (no screen) so a search on that would turn up several options. What you need to do is use another Mac to boot up in Firewire Target Mode as a one-time operation. While in there, set your OS for remote screensharing access in the Sharing prefpanel. You can also enable "Remote Login" if you do command line and that is very useful for headless controlling.

MacBook Pro won't sleep with external monitor

Hello,
have a problem. I'm using external monitor with my MacBook Pro. If I close the lid, I see all windows on external monitor and Yosemite won't sleep. Can you help me please? My external monitor is Samsung 21.5" and I'm connecting it to MacBook Pro via DVI.
Thank you

Hey Renecek,
My first thought was, "Hey, you are using closed-clamshell mode".
How to use your Mac notebook computer in closed-clamshell (display closed) mode with an external display - Apple Support
But then I realized, wait, you want it to sleep.
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I shoot weddings and need to run cs2 plus other programs and storage for photos.
I read in Macworld where they recc. the Macbook pro instead of a power mac as a work station using a 24" dell. They said the power mac is overkill.
Do you think I would be happy using it in this way?
I would save a bundle in buying another computer.
I do have an older PC now tower that I use..
I also would have to run windows since there are programs that i run on xp that they don't make for the mac.
Maybe I should just stay with a PC for the workstation?

if you meant compared to a powermac (ie, a G5), then the macbook pro is actually on par or faster than those machines. but if you meant the current mac desktop, the mac pro, then indeed that is a significantly more powerful machine.
be warned though.. adobe cs2 is currently not native for any intel mac, MBP or otherwise. so it's going to run much slower than what you'd expect, and much slower than what the machine is really capable of, due to emulation. this will be resolved with cs3, which should be out before the end of the month.
as for your windows apps that don't exist for the mac. before you jump in with the intention of definitely running windows on the MBP, you should take a look around and see if there are any mac programs that can do what you need to do with those apps, even if they aren't exactly the same. this may not be an option for you, but if it is, it's a nicer way to work than to be forced to use up all the extra disk space and system resources and effort, to have a windows install running as well. that said, if you can use these apps through parallels, it can be a pretty seamless way of accessing those apps when you need to.. but you'll chew into your drive space still.
but in principle, what you want to do is definitely achievable. you won't get the most bleedingly fast system that a mac pro desktop would give you.. but as I said, the current MBPs are right up there with the power of the G5 macs, in many cases faster, so it's definitely desktop class performance even if not in the same league as the mac pro. photoshop will annoy you if you try to run the non native version though.. so make sure you get the intel version (ie cs3) as soon as it comes out. all in all, together with a nice large 2nd monitor (and prob a good external drive too) it'll make for a great working setup.
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Macbook Pro doesn't wake with external monitor

I have a mid-2012 MBP that generally runs great.
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Kimapurado
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I have a problem connecting external display (Dell U2311H) to my 13" MacBook Pro (Early 2011).
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Hey Renecek,
My first thought was, "Hey, you are using closed-clamshell mode".
How to use your Mac notebook computer in closed-clamshell (display closed) mode with an external display - Apple Support
But then I realized, wait, you want it to sleep.
For that, check out the suggestions in these articles.
OS X Yosemite: If your Mac won’t go to or stay in sleep
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Take care,
Nubz

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I have a 2011 MacBook pro that is connected to a Dell U2410 24" monitor all the time via a DVI adapter.
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Yosemite: Turning off Macbook Pro screen (lid open) with external monitor connected

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