Apple has released SMC Firmware Update to address boot issues with the iMac (Early 2006), Mac mini (early 2006) and MacBook Pro (15-inch)
The SMC Firmware Update 1.0 is a System Management Control (SMC) firmware update for certain Intel-based computers, including iMac (Early 2006), Mac mini (Early 2006) and MacBook Pro (15-inch) computers. For more detail about SMC Firmware Update 1.0 please see this page.
The updater application will be installed in the /Applications/Utilities folder and will launch automatically after restart.
Mac mini (early 2006) SMC Firmware Update
MacBook Pro SMC Firmware Update
iMac (early 2006) SMC Firmware Update
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