Am trying to start up my MacBookAir but i couldn't, what should i do?

Hi,
am trying to start up my MacBookAir, but i coudln't. it shows a message of "your computer restatred because of a perblom, because press any key or wait a few seconds to contuine starting up" . then am trying to enter my Password then again shutdown and restart till the password point.
this problem apper after i downloaded the " OS X Mavericks" .
please what should I do..?!!
Regards,,
Miaad A. Ali

Hello miaad,
I would be concerned too if my MacBook Air was restarting with the message "Your computer restarted because of a problem."  I recommend following the steps in the section titled "Troubleshooting a recurring kernel panic" in the article below to help isolate and troubleshoot this issue:
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem."
http://support.apple.com/kb/TS4636
Thank you for using Apple Support Communities.
Best,
Sheila M.

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