3
What XOOPS version are you running?
Did you have your site set up to have one of your modules as its start page?
If not then it might be that one of more of the directories which need to be CHMOD 777 are not.
Also, it might be wise to clear the templates and website caches.
Also, reupload your modules - it might be that one or more became corrupted during the upload.
It looks like the "basics" are in place so hopefully you'll be back online before too long