MacBook Pro freezing with external monitor?

I recently got an external monitor to use with my MBP (early 09). So it seems that if I have my monitor hooked up (and maybe also when my power cable is plugged in) and my computer goes into sleep mode, the whole thing freezes and i have to hard restart my MBP. Is there a reason it is doing this? Also, if i close my MBP, instead of the computer going to sleep, it makes it go into mirror display mode and keeps it running on my external monitor (and sometimes it doesnt even go into sleep mode...). i found this thread - https://discussions.apple.com/thread/3190417?start=165&tstart=0 and it say to use the line:
"sudo nvram boot-args="iog=0x0""
in the terminal to make lion/ML work like SL, but any clue what else that will change?

Hi sgibson,
I'm sorry to hear you are having issues with the external display on your MacBook Pro. I also apologize, I'm a bit unclear on the exact nature or scope of the issue you are describing. Are you using the display in extended desktop or mirroring mode? If you are using it in extended desktop mode, is the issue limited to the external display, or does it also freeze the primary display as well? Does the same thing happen if the display is directly connected to the MacBook Pro (i.e. without the dock)? If you continue having issues, you may find the troubleshooting steps outlined in the following article helpful in isolating the cause:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Regards,
- Brenden

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Hi sgibson,
I'm sorry to hear you are having issues with the external display on your MacBook Pro. I also apologize, I'm a bit unclear on the exact nature or scope of the issue you are describing. Are you using the display in extended desktop or mirroring mode? If you are using it in extended desktop mode, is the issue limited to the external display, or does it also freeze the primary display as well? Does the same thing happen if the display is directly connected to the MacBook Pro (i.e. without the dock)? If you continue having issues, you may find the troubleshooting steps outlined in the following article helpful in isolating the cause:
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Regards,
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Hi bonfig,
If you are having issues with the external display settings on your MacBook Pro, it may be worth going throught the following article, in particular the portion about resetting the SMC and PRAM:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Cheers,
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Then I would try connecting your display in the off state and then turn it on once your MBP is sleeping. It's possible the MBP, or display in fact, is getting confused.
Also, always be sure your MBP has actually made into sleep by the pusating sleep indicator light. If it isn't pulsating it isn't sleeping.

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needs, as of this date, a thunderbolt display, as you will not be able to daisy chain anything other then thunderbolt displays. So you would get a thunderbolt display and then can use that to connect a second display to it with a dongle of your choice.
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nchelliah wrote:
Thanks for your help What about a HDMI to VGA cable? Would this work?
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MacBook Pro freezing with external monitor?

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