MacPro Jan 2008 16 GB mac RAM 2x3 GHz Quad-Core I installed 10.6.2 a little while ago - said it was successful and then began startup loading.....then screen went white and it hung. Waited and waited....finally gave up and turned it off, then on. This time it came up correctly, but had to detect second display, and also reset output speaker. Did same update on macbook pro with no issues. Anyone else have similar problem? Thanks.