Display turn on, then off during Login Screen

Hello all !
I've searched everywhere a solution for my problem, which is this :
I turn on my MacBook, after some seconds the backlight turn on but the screen remain black. After 1 minute, the standard blue screen appear, and also the mouse, and the charging screen.
But after 3 seconds before the login screen appear... the display turn off !
If i attach an external display, everything work, even the internal display turn on again. If i disconnect the external display, the internal stay on, but after a reset, it does it again like the first part of my message.
I don't think is an hardware failure, because if i start my MacBook in Safe Mode (Shift during startup), the internal display work perfectly !
What can be the cause ? Display settings ? Display driver ? Does a full system restore/reinstall will fix this issue ?
Thank you for help
David

You could try a hard reset but I doubt it will work:
1. Switch off the phone.
2. Hold down the following three buttons: Green (call answer button, * button, and '3' button.
3. While holding these buttons, press the power button and switch on the phone.
4. When the message 'Formatting' appears on the screen, release all of the buttons.
If this doesn't work then your only option is to visit a care point:
Care points:
UK
http://www.nokia.co.uk/A4228006
Europe:
http://europe.nokia.com/A4388379
Elsewhere:
http://www.nokia.com and select your country.

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MarkusLarockus wrote:
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