upgraded to 3.0 and no go

Try resettings your plugins. If that resolves the issue, reactivate each one individually until you find the cause.

I have no access to the admin panel.

If you can get to the file system via FTP try renaming the plugins directory to plugins-old.

If that does work and you can get back in, then rename the folder back to plugins and re-activate them one at a time until you recreate the problem.

Tried that but no success.

I see your site just renders a blank page.
I have the same problem (www.tboj.se hosted by one.com) but my site seems to load for a minute before nothing else happens.

I have tried to rename the plugins-folder but the problem persists.

After mailing the one.com technical support my problems are resolved.

They wouldn’t help me find it, but there is come bit of code somewhere that (probably) hasn’t timed-out which lead to php getting deactivated.

They reactivated it and now everything works again.

I’ll try the same with my provider!

A blank page is always a php error.

New development: I roled it back and it’s up and running again. New problem: can’t log in to admin through Internet Explorer! Works fine with Chrome, Safari & Firefox.