iMac 3.06 GHz Intel Core Duo: OS 10.6.3 was updated to 10.6.4 and real problems begun: Loudspeakers not working, neither Safari nor Firefox downloading anything as they should, etc... Trying to solve the problem: Of course repair HD with rights, at first (BTW: What a hell does cause tose continuous errors on HD? - no viruses found) After installing SnowLeopard from the original installation disk and the updating OS to 10.6.3 but naturally NOT to 10.6.4, the loudspeaker problem was solved but not the browser problem! When clicking the link, which should activate the download, both browsers start to process the work so as everything would be ok. However, the Download window is not activated and nothing appears in the download folder. The only possibility to download anything is to use the right mouse button and ask "save the file ...." This is not working with all links. I tried to do everything with Safari. Now the version is 4.0.4 and when trying to update it to 4.0.5 the system says : "not possible because there is a newer version of Safari". Strange, sounds too much windows! I am Mac user since 1989 and more than 20 years everything worked nicely before this Intel contamination. If things develop like this, I will become a Linux user!