External display no longer working - stuck at blue screen

Hi everyone. I just don't know what in the bloody **** happened here.
Everything was working fine, I even had my macbook 13 upgraded to 10.5.6 and it always worked fine with my external DELL 2007WFP screen thru DVI cable and miniDVI adapter.
Suddenly when I got home today and plugged the miniDVI adapter, I saw the screen blinking forever at the blue screen that usually fades out to both screens with extended desktop turned on.
If I unplug the miniDVI adapter, everything gets back to normal on the macbook screen. I plug it again, I get the blinking blue screen.
Tried rebooting, unplugging everything else from the external screen, no luck.
If I boot the macbook with the external screen on and the macbook closed, then it is recognized fine and I can use it, but when I want to use both screens, it will blink again.
I need to use both screens as that's how I arranged my workspace.
Again, everything was working fine yesterday.
Thanks

Did you ever figure out what was doing this, and more importantly, did you get it fixed? I have the same thing happening to my macbook 13. It has worked fine in the past with external displays, both mini-DVI to DVI and mini-DVI to VGA, and many types of monitors/projectors. All of a sudden last week, i try to connect to my external monitor and I get the flashing blue - dark blue - light blue - repeat...
I tried the command-f1 trick to switch displays, and it sits there for a second, my desktop will flash onto the external monitor for a second, and then it'll give up and go back to the repeating blues.
I ran the hardware test, both the short and the long, to no avail.
I tried with the lid closed and an external mouse and keyboard. I tried this both from the startup and from when the laptop was already on.
Any ideas? Time to go to the genius bar?

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External display no longer working

I recently purchased a Macbook Pro Retina 13" (Late 2013) model and was able to use it with my external display yesterday. Everything was working great out of the box and I was using the hdmi port on my mac to connect it to my monitor (dvi). Today though when I first turned on my mac after shutting it down for the night, my external display no longer receives a signal.
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So I somehow got it to work again, although it was unexpected, random and 100% luck.
I think what fixed it was that I switched off and unplugged the power strip that my monitor was connected to (I was reorganizing my cables). I didn't plug my rmbp right away though. The external monitor was still hooked up to my windows laptop. On a whim though I decided to plug the hdmi cable into my rmbp and it worked! My monitor set up also went back to how it was the other day.
I am sure that I didn't do anything on my rmbp that would have fixed it because I was just browsing internet on it. So if anyone is having this problem of where the monitor used to work but then suddenly didn't then I would suggest them to try this out. Let me know if anyone wants me to recall what I was actually doing. Good luck!
I think in the future to prevent this from happening again, I will probably unplug my rmbp from the monitor before shutting it down for the night.

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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
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 14:39:13 Nick-MacBook-Air-2.local WindowServer[154]: Display 0x042737c0: Unit 0: Startup Mode 1440 x 900, CGSThirtytwoBitColor, Resolution 1, ioModeID 0x80001000, ioModeDepth 0x0, IOReturn 0x0
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
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
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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My MacBook is stuck on blue screen... forever....
MacBook info:
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External display no longer working - stuck at blue screen

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