打开系统文件

     vim  /boot/grub/grub.conf

默认由0开始计数，因此须将default值改为0即可。

重启服务器

    reboot

-----------------------------

#boot=/dev/sda
default=1
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-194.17.1.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-194.17.1.el5 ro root=LABEL=/ rhgb quiet
        initrd /initrd-2.6.18-194.17.1.el5.img
title CentOS (2.6.18-194.17.1.el5xen)
        root (hd0,0)
        kernel /xen.gz-2.6.18-194.17.1.el5
        module /vmlinuz-2.6.18-194.17.1.el5xen ro root=LABEL=/ rhgb quiet
       
title CentOS (2.6.18-194.el5xen)
        root (hd0,0)
        kernel /xen.gz-2.6.18-194.el5
        module /vmlinuz-2.6.18-194.el5xen ro root=LABEL=/ rhgb quiet
        module /initrd-2.6.18-194.el5xen.img
title CentOS-base (2.6.18-194.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-194.el5 ro root=LABEL=/ rhgb quiet