Macbook Pro with Retina Display with Dell U2412m external monitor

I recently purchased the Dell U2412m monitor on Amazon hoping to use it as my external monitor to my Macbook pro 15" with retina display, however, when I finish setting it up, there's a red/pink vertical line showing on my screen. Does anyone know what seems to be the problem and how do I get rid of the line. Is there anything I need to set up on the monitor to make it compatible with MBP with retina?? Thanks in advance.

I used a mini display port to display port cable and my screen looked fine. My problem was that the USB ports did not work and dealing with Dell customer service was a nightmare.

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That would at least partially explain it.
These MacBook Pros drew more power than the power brick could readily supply, and so would only run at top speed when the power brick was supplemented by the battery.
Though the applicable tech note has been removed, it stated:
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Message was edited by: dalefromdeatsville

Howdy dalefromdeatsville,
Thanks for using the Apple Support Communities.
To troubleshoot this issue where you're seeing graphical distortion on your Mac's display, please follow the instructions below.
Reset the system
You can reset the Mac's parameter RAM and SMC.Reset the resolution
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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.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Cheers,
Alex H.

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Hi all,
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Hello
Does anyone know
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http://support.apple.com/kb/ht3924
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Thanks for the fastest reply. Well, As I said I'm non tech noob on Macbook Pro.
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Hello Shailendras33,
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Firstly, I found some information on page 11 of the MacBook Pro User Guide about what each color of the LED means on the Power Adapter:
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MacBook Pro User Guide
http://manuals.info.apple.com/en_US/macbook_pro_15inch_late_2011.pdf
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Shut down the computer.
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Macbook Pro with Retina Display with Dell U2412m external monitor

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