Index.php blank after upgrade

[<?netwire>]

I've completed a 1.1.4 upgrade to 2.0.3 however the page is now blank and not loads on it. I should also note that it found several language file updates needed to themes which I no longer have installed - how can I reset the list of themes it's pulling from the database?

[shadow82x]

Hmmm take a look in FTP

Tell me if you see coding in index.php

Are you sure you reuploaded /Themes before the upgrade?

[metallica48423]

also check your webserver's error log if possible (if not, ask your host to)