Display becomes brigthly and stops working what can I do ?

Hi,
I´ve got a problem with my macbook.
My display becomes brigthly and stops working.
It happens every two minutes after you work with the macbook.
If I change the position of the display its working again.
Do you have any ideas to solve this problem ?
Thank you so much
Sabrina

While it sounds like it may be a hardware issue, perhaps wiring to the screen since the symptoms change when you move the screen, you can try an SMC and PRAM reset to see if that makes a difference (and they won't hurt anything):
SMC: http://support.apple.com/kb/ht3964
PRAM: http://support.apple.com/kb/ht1379
You can also run the Apple hardware test to see if it spots any obvious hardware issues (although if it's a wiring problem, it may not pick that up). See http://support.apple.com/kb/ht1509

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