Hello i downloaded OS X Mavericks on m'y MacBook Air OS X Lion 10.7.4 and since my computer restarted my screen is strange and unresponsive.

hello i downloaded OS X Mavericks on m'y MacBook Air OS X Lion 10.7.4 and since my computer restarted my screen is strange and unresponsive.

Hi Anna Dominik,
I apologize, I'm a bit unclear on the exact nature of the issue you are having. If you are saying that your computer isn't starting up successfully after your software upgrade, you may find the troubleshooting steps outlined in the following article helpful:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Regards,
- Brenden

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