If you have not checked for recent software updates on your Mac you may want to open it up and give it a go. The 1.4 EFI update addresses noise made by the MacBook optical drive during startup. The other update is 1.0 for Airport client and addresses the following:
An Inability to turn AirPort on or off in some cases after upgrading from Mac OS X Leopard.
An occasional loss of network connection when using Wake on Demand.Read More