MBP early 2010 EFI update, external display no longer functioning

I just updated my MBP early 2010 to EFI 2.6 and now my external display (U2711 connected via displayport) doesnt display anything anymore. (exactly right after restart without touching anything)
The monitor tries to show something right after boot but then goes into power saving mode. It worked perfectly the second I updated.
Any ideas? I already resetted PRAM/NVRAM and I could connect the display successfully by way of HDMI so it may have something to do with the resolution (2.560 x 1.440 (WQHD) or displayport.
- Lennix

This solved my problem: http://macosx.com/tech-support/mac/where-are-display-settings-stored/18326.html
bobw wrote:
Hi Tony
First dealmac, now here
Try trashing these files
~/Library/Preferences/ByHost/
com.apple.windowserver.0030654fec7a.plist
and
com.apple.preference.displays.000a27e3cb12.plist
Bobw - Macosx.com Tech Support

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****Error Log Below****
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Received display connect changed for display 0x42737c0
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Found 16 modes for display 0x042737c0 [16, 0]
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Received display connect changed for display 0x3f003d
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Found 1 modes for display 0x003f003d [1, 0]
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Received display connect changed for display 0x3f003e
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Found 1 modes for display 0x003f003e [1, 0]
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Display 0x042737c0: GL mask 0x1; bounds (0, 0)[1440 x 900], 16 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9cdf, S/N 0, Unit 0, Rotation 0
UUID 0x2fa49b462ac314062ce76fce977d6525, ColorSpace { 189789772 }
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: GLCompositor: GL renderer id 0x01024301, GL mask 0x0000000f, accelerator 0x00003ab3, unit 0, caps QEX|MIPMAP, vram 451 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Display 0x003f003f: GL mask 0x8; bounds (2464, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: GLCompositor: GL renderer id 0x01024301, GL mask 0x0000000f, accelerator 0x00003ab3, unit 0, caps QEX|MIPMAP, vram 451 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
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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
UUID 0xffffffffffffffffffffffffffffffff
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Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: CGXDisplaysDidReconfigure: Display added
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: CGXDisplaysDidReconfigure: Display removed
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Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9cdf, S/N 0, Unit 0, Rotation 0
UUID 0x2fa49b462ac314062ce76fce977d6525, ColorSpace { 189789772 }
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: GLCompositor: GL renderer id 0x01024301, GL mask 0x0000000f, accelerator 0x00003ab3, unit 0, caps QEX|MIPMAP, vram 451 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Display 0x003f003f: GL mask 0x8; bounds (2464, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: GLCompositor: GL renderer id 0x01024301, GL mask 0x0000000f, accelerator 0x00003ab3, unit 0, caps QEX|MIPMAP, vram 451 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Display 0x003f003e: GL mask 0x4; bounds (2465, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 2, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
Mar 2 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Display 0x003f003d: GL mask 0x2; bounds (2466, 0)[1 x 1], 1 modes available
off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
Mar 2 14:39:15 Nick-MacBook-Air-2.local WindowServer[154]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
Mar 2 14:39:15 --- last message repeated 1 time ---
Mar 2 14:39:15 Nick-MacBook-Air-2.local WindowServer[154]: CGXSetDisplayColorProfileAndTransfer: Display 0x042737c0: Unit 0; ColorProfile { 189789772 }; TransferTable (256, 12)
Mar 2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AMBD Agent: xpc connection became invalid during event handler
Mar 2 14:39:15 Nick-MacBook-Air-2.local WindowServer[154]: CGXSetDisplayColorProfileAndTransfer: Display 0x042737c0: Unit 0; ColorProfile { 189789772 }; TransferTable (256, 12)
Mar 2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AMBD Agent: xpc connection became invalid during event handler
Mar 2 14:39:15 Nick-MacBook-Air-2.local DMProxy[612]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
Mar 2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AmbientDisplayAgent started
Mar 2 14:39:15 Nick-MacBook-Air-2.local WindowServer[154]: CGXSetDisplayColorProfileAndTransfer: Display 0x042737c0: Unit 0; ColorProfile { 189789772 }; TransferTable (256, 12)
Mar 2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AMBD initializing devices
Mar 2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AMBD Agent: xpc connection became invalid during event handler
Mar 2 14:39:15 Nick-MacBook-Air-2.local DMProxy[613]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
Mar 2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AmbientDisplayAgent started
Mar 2 14:39:15 Nick-MacBook-Air-2.local WindowServer[154]: CGXSetDisplayColorProfileAndTransfer: Display 0x042737c0: Unit 0; ColorProfile { 189789772 }; TransferTable (256, 12)
Mar 2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AMBD initializing devices
Mar 2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AMBD Agent: xpc connection became invalid during event handler

Howdy Haknat,
Thanks for using the Apple Support Communities.
If you're still seeing no image on the external display after resetting the SMC and PRAM, then the next step I'd like you to do is to start the device in Safe Mode.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
If you tried all of these steps for your display and the video issues persist, contact Apple technical support or take your Apple computer to the nearest Apple Store or Apple Authorized Service Provider (AASP) for diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Take care,
Alex H.

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