made a backup of my forum, restoring it doesnt work

[xtremeutvforums]

my site, xtremeutvforums.com is down. all i can get is blank pages. i cant even log into the admincp. nothing works.

The site was working just fine yesterday. Im running vBulletin 3.8.4 with vbseo, vbadvanced, and some other plugins/products. I wanted to install a new plugin, so I made a backup of all the files and the database. the new plugin didnt work, so i deleted everything, then attempted to restore the backup I had made last night. I put all the files back in place, and wiped out the database then re-uploaded the backup. now all i get is white pages.

I cant figure out any reason why im having this problem. any ideas?

--------------- Added [DATE]1271973395[/DATE] at [TIME]1271973395[/TIME] ---------------

I dont know if this could have anything to do with it, but when i backed up the files i did it through the file manager in plesk. the site is on a godaddy virtual dedicated server with plesk 9.3. i went into the file manager in plesk and copied all the files to a separate folder. then when i tried to restore the site i also used the file manager to copy all those files back to their original location.