The white screen appeared after I deleted some images that my wife uploaded to the wp-content folder instead of the uploads folder(...Blog/wp-content/uploads).
I tried to resolve the issue by upgrading from 2.0.4 to 2.3.2 (using LeechFTP) but I still have the white screen.
I can login to Admin just fine. After logging in, if I go to Presentation->Theme I see: Warning: array_keys() [function.array-keys]: The first argument should be an array in /usr4/u/1/psimmond/public_html/Blog/wp-includes/theme.php on line 298
If I select the Theme Editor tab, I get the same message and under it it says "The requested theme does not exist."
I deleted my theme called "connections" from the themes folder (...wp-content/themes/). Now there are just the two included themes--classic, default.
When I go to Presentation->Theme it doesn't show any themes. Likewise when I go to Plugins it shows nothing although I noticed when uploading Version 2.3.2 that this version includes a plugin called akismet.
My url is: http://www.edcen.ehhs.cmich.edu/~psimmond/Blog/
It is hosted by the university (~psimmond is root and Blog is second level)