Screen went dark then in colour pixeled

hi... my screen went dark, then appeared again in raw coloured pixels. able to use cursor and programs. Restarted and problem disappeared. But happened twice more.
Appears to be instable.
Thanks for any hints and help.
Ursula

Hello ursulafromlangendorf,
The resource below will provide some troubleshooting steps to consider if you are having issues with the video display on your MacBook Pro.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
http://support.apple.com/en-us/HT201177
Regards,
Judy

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