Take a look at what JEM just posted. There's a line in the code in that file that you can comment out and try depending on your hosting configuration...
## Can be commented out if causes errors, see notes above.
Options +FollowSymLinks
To comment it out, change it to this...
## Can be commented out if causes errors, see notes above.
## Options +FollowSymLinks
Sometimes this can be a permissions issue among other things depending on how you're hosting is set up.
The urls are not actually re-written by Joomla. All those settings do is tell the site to use a feature that's on your hosting set up. There's a chance that this feature is not turned on. You can ask your host if things are set up to use url rewrite rules.
The urls are not actually re-written by Joomla. All those settings do is tell the site to use a feature that's on your hosting set up. There's a chance that this feature is not turned on. You can ask your host if things are set up to use url rewrite rules.