My Macbook Pro display flickers when using power adapter

I purchased a new power adapter for my Macbook Pro (late 2011 17 inch) from Other World Computing and now the display flickers intermittently when attached to the new power adapter. There is no flickering when not attached to the power adapter or when attached to the old power adapter.
Any ideas on fixing the new power adapter? I would rather fix the problem if it is simple.
Thanks for the help.
Roy Patience

It doesn't affect the battery. You can use your MacBook Pro plugged in all the time without damaging the battery. You only have to be sure that you unplug it and run a battery cycle (drain the battery without letting the Mac turn off and charge it fully) at least once a month to keep the battery life.
If you want more information about your battery > http://www.apple.com/batteries/notebooks.html

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Hello,
i'm having, again, an issue with my macbook pro 17' mid 2010.
This is my story
I bought it in July 2010, it worked fine until one month after the end of the one year warranty period (shouldn't be two years in Europe?).
I don't remember if it was on sleep or power off but that day three bands appeared in the middle of the screen:
One is more or less 1cm , colored and flickering, next an half cm white one sometimes flickering with a green tone and, last, another 1 cm colored and flickering.
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I went there, they asked me 50€ (living in France…) only to take in charge my mac plus, in case, additional costs.
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Disk Sleep Timer (Minutes):    10
Display Sleep Timer (Minutes):    10
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AutoPowerOff Enabled:    1
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Disk Sleep Timer (Minutes):    10
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Wake on Clamshell Open:    Yes
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AutoPowerOff Enabled:    1
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Standby Enabled:    0
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Genius reservation http://www.apple.com/retail/geniusbar/
on-line https://getsupport.apple.com/GetproductgroupList.action
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My Macbook Pro display flickers when using power adapter

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