I'm without my MacBook Pro at the moment (possible faulty logic board), so I'm stuck with my G3 iMac. Great computer, but I didn't realise how poor 10.1 is. I've run software update, which says that I needed to do a manual update due to a security flaw in the Software Updater, which I did. It then updated IE5, but that's it. It won't update anything any further. I tried downloading and installing the Security Update 10-19-01, and that won't let me select Macintosh HD to isntall into. Neither will the OS X 10.1.1, Installer Update 1.0 or 10.1.5 combo update!!!! It's very frustrating and I can't find anything on Apple.com to help me. What should I do next? I'm currently on 10.1... EDIT: I'm actually already on Installer 1.1, so I don't need to worry about that, but it won't let me do the security update. Macintosh HD is greyed out... Many thanks!!