[CentOS] Can't boot Centos6 ext4 partition from GAG bootloader

Have just installed Centos-6 from a Linux Format DVD.
   The install went smoothly, although the installer inisisted that
the root partition had to be formatted ext4.

When my GAG boot loader tried to boot from that root partition,  
it was unable do so.

Elsewhere I read that GAG cannot boot from an ext4 parititon.

I there any way tp persuade Centos-6 to use an ext3 root partition?
-- 
/\/\aurice 
	(Retired in Surrey, UK)