If you want to delete the plugin, try this, it worked for me and your site should be back to normal. Found this in one of the other threads:
You'll have to do this from cPanel or your FTP client:
To uninstall W3 total cache plugin, you need to follow following procedure:
- Delete W3 total Cache plugin from Wp-content/plugins folder
- Remove this line from Wp-config file (define(‘WP_CACHE’, true) )
- Delete advanced-cache.php, db.php, wp-total-cache-config.php and delete entire w3tc folder from wp-content folder.
- Check .htaccess file and if you see any code added by w3 total cache plugin, do remove it.
There is another thread in regards to the blank page (the above is when all you see is server errors). Click through each individual thread (must have been page 2 or 3) and you'll find it. It was about a missing file 'master.php' or something, but I believe the plugin author already fixed this issue.
I'd like to use W3 Total Cache too, but cannot, as all I get is 500s.