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After boot you are getting console with initramfs command.
It means, your system uses wrong system drive for boot.
How to solve? Do the following:
1. Find the partition you installed OS on
initramfs> blkid
2. Mount partition with your OS:
initramfs> mkdir /mnt
initramfs> mount /dev/sda1 /mnt
initramfs> mount --bind /sys /mnt/sys
initramfs> mount --bind /dev /mnt/dev
initramfs> mount --bind /proc /mnt/proc
initramfs> chroot /mnt
3. Update Grub
initramfs> update-grub
initramfs> grub-install /dev/sda

4. Reboot and cross your fingers
initramfs> reboot

Sometimes, when hdd feeling bad, your OS can’t start normaly.
And you are getting grub concole, like: grub >
The easiest way to boot your kernel:
1. check the list of drives
grub> ls
(hd0) (hd0,gpt2) (hd0,gpt1)
2. Check /boot folder on the drive (or another folder, depends from your server structure)
grub> ls (hd0,gpt1)/boot/
. .. grub initrd-2.6.32-ovz-el-alt88.M60P.1.img System.map-2.6.32-ovz-el-alt88.M60P.1 vmlinuz-2.6.32-ovz-el-alt88.M60P.1
3. Booting
grub> set root=(hd0,gpt1)
grub> linux /boot/vmlinuz-2.6.32-ovz-el-alt88.M60P.1 root=/dev/sda1
grub> initrd /boot/initrd-2.6.32-ovz-el-alt88.M60P.1.img
grub> boot

Another way is more complicated. And you should use it, if you got an error “grub unknown command linux”
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While installing some package via yum, you can receive the error “Package mysql.noarch.rpm is not signed”.
It means you are using not official repositary.
To solve this problem, just add --nogpgcheck
Example
yum install mysql --nogpgcheck