As I was attempting to use Bootcamp assistant , I was told to upgrade my system (I used bootcamp with the existing system quite easily just days back). As I was upgrading the mac os to 10.5.4 with installation (total 560MB), I saw after about 250 or so MB download my macbook asked me to restart it for installation. I did accordingly. But installation bar stops at 1 cm.I tried hard reboot, still the same. Any body faced similar problem?