Upgrade to 2.3.1: can’t access dashboard

@mrkingid: of course it doesn’t 🙂

@michaelh: I have deleted and reuploaded WordPress files but it doesn’t work. When I try to execute http://www.hitechmania.com/wp-admin/upgrade.php it takes me to dashboard -> presentation and there is:

No Sidebars Defined

You are seeing this message because the theme you are currently using isn’t widget-aware, meaning that it has no sidebars that you are able to change. For information on making your theme widget-aware, please follow these instructions.

I can’t do this without access to the dashboard…the widget error page is the only one I’m able to see, and I get it by executing http://www.hitechmania.com/wp-admin/upgrade.php …is there another way to change theme and deactivate plugins (btw, I deactivated them before the update) by changing something in the database?

Done, but still not working. Same problems as before… 🙁

I have a backup. I’ll try and let you know… 🙂

Ok, so…I removed WP 2.3.1 files and restored the old 2.1.2 files.
After that, I tryed once again and I got a slightly different problem:
on http://www.hitechmania.com/wp-admin I get

Fatal error: Call to undefined function get_admin_page_title() in /var/www/hitechmania.com/wp-admin/admin-header.php on line 12

But now if I try to execute http://www.hitechmania.com/wp-admin/upgrade.php the browser say that the page is not redirecting properly (cyclic redirect)… The URL become something like: http://www.hitechmania.com/wp-admin/upgrade.php?_wp_http_referer=%2Fwp-admin%2Fupgrade.php%3F_wp_http_referer%3D%252Fwp-admin%252Fupgrade.php%253F_wp_http_referer%253D%25252Fwp-admin%25252Fupgrade.php…and so on.