I updated earlier tonight to 10.4.7 via the Software Update. Since then I've noticed a couple things. First of all, I cant hear online audio! Quicktime videos play audio online, but YouTube videos are silent, and songs on myspace pages are silent just to name a couple. How do I fix this? Also, My 2.0ghz 2gb (self installed weeks ago) white MacBook is shutting down unexpectedly. Anyone else experiences either of these?