I recently installed the OS X 10.8.5 update on my MacBookPro3,1. Ever since, the laptop will freeze about 1-3 minutes after booting, meaning: any activity will stop, screen is unchanged, laptop doesn't react anymore to keyboard input, trackpad or network pings. I tried disconnecting all external devices, but the same behaviour continues. If I boot the computer in rescue mode or from an older backup, no freezes occur. Any idea how I could fix the problem without a reinstall, or at least how I could investigate it? Update: Same problem appears with 10.9, please see last post.