I've tried everything, absolutely everything to get wordpress 2.7 to work. So as a drastic step I deleted the entire folder after backing it all up, first the database then the files for wordpress on my server, deleted everything, then uploaded the new 2.7 wordpress, changed the wp-config file to be able to connect to my database. Then my blog shows up in the default wordpress theme, but after logging into the admin panel the page goes blank and doesn't do anything.
What do I do next? Could it be something to do with permissions of certain files or something, or what is my problem?