As your product is covered by an international Apple warranty, we recommend you follow their troubleshooting steps at the following link:
http://www.apple.com/au/support/
Please select the laptop model you have and then follow the troubleshooting steps applicable to your issue.
If you are unable to resolve your issue through this process, please visit the following link to arrange a Genius Bar appointment to have your laptop inspected:
http://www.apple.com/retail/geniusbar/