When my hard drive is not clicking. It takes exactly 37.44 seconds for my computer to start up. Im running Snow Leopard in the 64 bit kernel. My specs are 2.53GHz Intel Core 2 Duo 4GB DDR3 250GB Hard drive 7200 rpm 512 MB video card and 256 MB shared video I used my iPods stop watch to time it. I hope I posted this in the right place!