Mini display port - vga only works with lid closed - then computer goes to sleep

my problem is simple, but strange.
I have a 2009 unibody macbook pro. I have 42 in lcd tv. I have a minidisplay to vga adapter and a vga cable. When I try to connect the monitor to the mbp when the lid is open nothing is detected. I do not get any options to change to mirror mode or am able to change any settings regarding the monitor. I can change the resolution of the built in display only. Now for the twist.
If I connect everything, do a restart and close the lid, as the computer boots up the external monitor works. Its the grey boot screen with the apple logo. But as soon as the computer begins to load the desktop, the monitor losses the signal. At first I thought it was going into sleep mode, so I hooked up a usb mouse to keep the computer awake. I tried the process again, and as soon as it goes to the desktop it losses the signal. So I don't think it is sleep mode.
I downloaded the minidisplay prot firmware update, but because the screen is not detected when the lid is open I cant run it. When the lid is closed the computer either goes to sleep or doesn't send the desktop signal and I still cant run it.
Nothing happens if I change between the video cards (9400 and 9600gm). Is it a resolution issue? Do the vga cables have a max resolution that is lower than 1900 x 1200?
What should I do? thanks
2009 unibody intel macbook pro
running 10.6.8
3.06 ghz 8gb ram

see all this time you DID have the info i was looking for:
"Do the vga cables have a max resolution that is lower than 1900 x 1200?"
3 posts later
"The VGA displays Apple has typically in the past offered only had 1024 x 768 resolution at most."
im sorry I inticed you to giving me the information i needed, but i guess it was required. you have earned your 10 points today.

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Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9ccb, S/N 0, Unit 0, Rotation 0
UUID 0x4f159f59a71d63aefce94e26fc6d6edd, ColorSpace { 2068752606 }
1/31/15 10:36:47.594 PM WindowServer[443]: GLCompositor: GL renderer id 0x0102261a, GL mask 0x00000003, accelerator 0x0000429b, unit 0, caps QEX|MIPMAP, vram 256 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
1/31/15 10:36:47.594 PM WindowServer[443]: Display 0x003f003f: GL mask 0x4; bounds (2304, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
1/31/15 10:36:47.594 PM WindowServer[443]: Display 0x003f003e: GL mask 0x4; bounds (2305, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
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off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
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1/31/15 10:36:47.605 PM WindowServer[443]: CGXDisplaysDidReconfigure: Display removed
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Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9ccb, S/N 0, Unit 0, Rotation 0
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UUID 0xffffffffffffffffffffffffffffffff
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off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
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1/31/15 10:36:49.605 PM WindowServer[443]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
1/31/15 10:36:49.712 PM WindowServer[443]: CGXSetDisplayColorProfileAndTransfer: Display 0x042732c0: Unit 0; ColorProfile { 2068752606 }; TransferTable (256, 12)
1/31/15 10:36:49.767 PM WindowServer[443]: CGXSetDisplayColorProfileAndTransfer: Display 0x042732c0: Unit 0; ColorProfile { 2068752606 }; TransferTable (256, 12)
1/31/15 10:36:49.771 PM com.apple.AmbientDisplayAgent[313]: AMBD Agent: xpc connection became invalid during event handler
1/31/15 10:36:49.822 PM com.apple.AmbientDisplayAgent[313]: AMBD Agent: xpc connection became invalid during event handler
1/31/15 10:36:49.865 PM DMProxy[647]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
1/31/15 10:36:49.875 PM WindowServer[443]: CGXSetDisplayColorProfileAndTransfer: Display 0x042732c0: Unit 0; ColorProfile { 2068752606 }; TransferTable (256, 12)
1/31/15 10:36:49.923 PM com.apple.AmbientDisplayAgent[313]: AmbientDisplayAgent started
1/31/15 10:36:49.929 PM com.apple.AmbientDisplayAgent[313]: AMBD initializing devices
1/31/15 10:36:49.940 PM com.apple.AmbientDisplayAgent[313]: AMBD Agent: xpc connection became invalid during event handler
1/31/15 10:36:49.942 PM DMProxy[648]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
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1/31/15 10:36:54.946 PM DMProxy[648]: AMBD Services serviceSendMessageWithReplyAndTimeout:131: Semaphore timeout when waiting for reply to message ID 2
1/31/15 10:36:54.946 PM DMProxy[648]: AMBD Services serviceSendMessageWithReplyAndTimeout:131: Semaphore timeout when waiting for reply to message ID 1
1/31/15 10:36:54.948 PM com.apple.AmbientDisplayAgent[313]: AMBD initializing devices
1/31/15 10:36:54.960 PM WindowServer[443]: CGXSetDisplayColorProfileAndTransfer: Display 0x042732c0: Unit 0; ColorProfile { 2068752606 }; TransferTable (256, 12)
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My external display via VGA only works when macbook air is shut?

I'm using a MDP to VGA to connect my 2012 Macbook Air to an external display. When the Air is open I can view only the desktop (no open apps). The open apps only appear on the external monitor when I close the Air (after a couple of seconds)!! Have I accidently altered some settings somewhere??? Makes no sense to me.

Update - I ended up spending about an hour on the phone with a very helpful rep from AppleCare. He was also stumped by this problem. We ended up solving it by using a remote screen-share app that allowed him to see what my video card was sending to the external display, and he directed me over the phone to change the settings (quite funny really - it was literally "move your mouse up a tiny bit, now click, now left, etc).
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A few month ago, I purchased a new 2012 13" MacBook Pro. I quickly realised that my non-Apple MDP to VGA adapter was not working, but put off the problem as it wasn't neccesary -- and I thught that the adapter was to blame. However, after using the adapter sold by Apple, I can asafely say that the problem is with my computer. In review on the product, several 2012 MacBook Pro users mention this. I was hoping someone here would be able to point me towards a solution! Thank you.

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