My white macbook screen only works shortly when booting and when adjusting the brightness (turning it all the way down and up from there) and only stays on for seconds. any idea what to do?

Hi. I'm having quite an issue here. My macbook screen is only lid when i boot and when i adjust the brightness of the screen (going all the way down and up from there). either way it goes black again after a few seconds. External monitor works though.
Any ideas on how to solve this?
Lasse

I buy the dirty theory as well.  plug and unplug a whole bunch of times - you may be able to dislodge whatever is causing the issue.  Also - make sure the plug is fully seated - (some of the pad jacks are vert tight, and you really have to work them in).  I gather you are out of warrenty?  Blow in the hole.
last resotr - take a toothpick, dip the end in fingernail polish, get rid of the xs, then very very gently, insert the pick and try to rub the contacts.  very gently as you do not want to bend them.

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