First, thanks in advance for the help. I have an iMac, with 10.4 tiger installed on it. For some reason, all my applications except safari and a few third party ones will not start. when clicked on in the dock they simply bounce once. Finder is affected as well, so I can't search for them and try it that way. I was going to reinstall OS X, as I saw on the forum that that helped someone with a similar problem. However, when I put the CD in it makes a wierd noise and doesn't start. When I put Disk 2 in, it doesn't make the wierd noise but it still doesn't start. I believe this could be because an application it uses to open cds doesn't start.