Think T400 Screen flickers when i plug-in the power card

Hi,
I have recently bought the T400 .I have a strange problem
If i boot my laptop without power card and after some time if i plug-in the power card the screen is flickering continuously. if i remove the power card it stops flickering...
Any one has any idea what could be the problem.

If you have not updatged the video driver, then I would try that.
Version 6.14.10.5002
[Important] After plug in the AC adapter, some garbages may be displayed on LCD screen on limited condition.
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-70127
Terry
LESE

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