Site dead after Devel Module and Library sethtmldom After installing Devel Module (and Library simplehtmldom), the Drupal7 site is completely dead. Have already set the module to 0 on System table in database, and the module files removed by FTP. But still no recovering. How to remove simplehtmldom Library? What else to recover the site? Thanks.
You can try using Registry Rebuild

Project page says..


  THIS IS NOT A MODULE. YOU CAN'T ENABLE IT. FOLLOW THE INSTRUCTIONS.
  
  Make a backup of your database before running this. It won't break
  your database, but we can't improve this unless we have broken
  databases that it doesn't quite do the job for.
  
  There are times in Drupal 7 when the registry gets hopelessly hosed
  and you need to rebuild the registry (a list of PHP classes and the
  files they go with). Sometimes, though, you can't do this regular
  cache-clear activity because some class is required when the system is
  trying to bootstrap.
  
  When would you need Registry Rebuild? You might get something like:
  
  PHP Fatal error:  Class 'EntityAPIControllerExportable' not found in
  ...sites/all/modules/rules/includes/rules.core.inc on line 11