Blank screen on mac pro notebook

two days ago i slammed my mac without shutting down. The next day I found the screen blank. when I connected the mac to the tv screen using hdmi cable, I could see every thing on the tv screen as usual.
i tried several things, but the screen only goes from black to white and nothing else.
can any one help please?

Hi mohamedfromoctober,
If you are having issues with a blank or black screen on your Mac (but can see the proper display image on an external display), you may inadvertently be in Closed Clamshell mode, especially if you are running 10.6.8 or earlier. If so, you may find this article helpful:
Mac notebooks: How to use your computer in closed clamshell (display closed) mode with an external display
If you are still having issues or it is not a Closed Clamshell issue, you may find the troubleshooting steps outlined in the following article more useful:
Apple computers: Troubleshooting issues with video on internal or external displays
Regards,
- Brenden

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