Server error (?) after installation

A second WP-installation at a second webserver failed (the first works fine but at another server). The first (working) installation is runned on UNIX. I’m not sure what webserver the second server is running.

What I’ve done:

Installed a clean WP on the new website with a completely clean database. Configured the config-file accordingly. Ran the install and everything works fine up to completion of the second step.

This is what happen:

When I click wp-login I apparently get logged in but it only ends up with with a page saying:

302 Found

Found
The document has moved _here_.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

The _here_-part is a link back to wp-login. When I click the link I get back to the same page.

When connecting to the blog’s startpage I get there – only that the page has lost all CSS formatting.

When I connect to wp-admin it looks OK (CSS and all), but I still get the same error message on some pages.

Please help.

//thore