Apache Web Problems

Last night, after working OK for a while, I received an error whilst accessing an install of SugarCRM on a dedicated domain: startSession(); $app->execute(); ?>

I did not check then, but this morning I checked other sites and have notices that: Wordpress sites deliver a blank page

Joomla sites have these errors: mark('afterLoad') : null; // Instantiate the application. $app = JFactory::getApplication('site'); // Execute the application. $app->execute();

or

mark('afterLoad') : null; // Instantiate the application. $app = JFactory::getApplication('site'); // Initialise the application. $app->initialise(); // Mark afterIntialise in the profiler. JDEBUG ? $_PROFILER->mark('afterInitialise') : null; // Route the application. $app->route(); // Mark afterRoute in the profiler. JDEBUG ? $_PROFILER->mark('afterRoute') : null; // Dispatch the application. $app->dispatch(); // Mark afterDispatch in the profiler. JDEBUG ? $_PROFILER->mark('afterDispatch') : null; // Render the application. $app->render(); // Mark afterRender in the profiler. JDEBUG ? $_PROFILER->mark('afterRender') : null; // Return the response. echo $app; (this is an older version of Joomla)

On searching the forums, I did see a note that it could be something to do with APC cache, which, coincidentally, I tried to install the other day, but think I failed!!!!

Does anyone have any ideas?