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What happened (or what was changed) before this problem appeared?
Regardless, you can boot up from a Linux live CD, mount the server's hard drive, and look for the /boot directory---check there for the kernel and initrd files.
also tell us what the hardware is and what version of Linux.
@OP, follow this. It seems something misplaced your kernel and the only way to fix now is login using live cd/usb, chroot to your distro's partition:
# mount /dev/foo /mnt/yourdistro
# mount /dev/foo1 /mnt/yourdistro/boot <---- Note, this step is not required if you don't have a separate boot partition.
# mount --bind /dev /mnt/yourdistro/dev
# mount --bind /sys /mnt/yourdistro/sys
# mount --bind /proc /mnt/yourdistro/proc
# chroot /mnt/yourdistro
Once you do that, you will have access to your system.
Depending on your distro, use the relevant package manager command to reinstall kernel; may be using yum/apt/emerge/whatever.