Apache Never runs after configuring eAccelerator and FastCGI

I recently configured accelerator and fastcgi with apache using: http://secure-ubuntu-server.blogspot.com/2009/07/howto-performance-tuning-of-lamp-and.html

Now my Apache never starts.

Logs shows:

Mon Jul 20 16:12:24 2009] [notice] ModSecurity for Apache/2.5.6 (http://www.modsecurity.org/) configured.
[Mon Jul 20 16:12:25 2009] [notice] FastCGI: process manager initialized (pid 10919)
[Mon Jul 20 16:12:25 2009] [alert] FastCGI: read() from pipe failed (0)
[Mon Jul 20 16:12:25 2009] [alert] FastCGI: the PM is shutting down, Apache seems to have disappeared - bye

Solution 1:

What's the exact version of PHP you're using? eAccelerator isn't compatible with PHP 5.3 - honestly, I'd strongly recommend APC or XCache above eAccelerator.