Your best bet is to delete /plugins/buddypress/ and then visit yoursite.com/wp-admin/plugins.php. Then change the theme back to the WordPress default (Kubrick).
You can then reinstall BuddyPress and reactivate the BuddyPress theme. You won’t loose any of your BuddyPress database data doing this, though I recommend making a backup of your database with phpMyAdmin as a matter of good practice.
Thank you for your reply.
I will try this out and see how it goes and report back if it works.
Hmmm I deleted Buddypress from plugins
But when trying to go to admin or anyother area of my site, I still get the blank page thing.
This is all i get in the source
`
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”>
<HTML><HEAD>
<META content=”text/html; charset=utf-8″ http-equiv=Content-Type></HEAD>
<BODY></BODY></HTML>
In WordPress WPMU I am using the Arlite theme.
I thought if I had delted Buddypress, everything would have just gone back to normal. Can’t understand why my whole site is not working.
Am trying to find away in phpmyadmin to reset the theme since no pages or admin areas are loading.
Hmm.
Next on the list is renaming the plugin directories one by one to see which one is offending. There’s something left over somewhere that’s causing the white screen.
Quite often, it ends up being a duplicated function somewhere, or a function being called upon that no longer exists in the code. Theme customizations are prone to that kind of thing a lot.
Thank you for your reply.
I will go through and rename each plugin one by one until I can gain access to my admin area.
LOL I didnt have to go far to find out which plugin..
hehehe it was Achievements…
Funny how something so simple can make a site not function.
Thanks so much for both of your help 
I’m marking this topic as resolved.
