initramfs ERROR!

Your PC starts and shows boot screen like:

intramfs:

Some reasons:

1. Maybe you play around with your drives.
2. Maybe with some other OS.
3. Maybe there was an abnormal shutdown.

How to solve it:

1. Boot with any live cd.
2. Run >  sudo fdisk -l /dev/sda1 (if sda1 is your main partition; where your linux is installed)
   It will show the output regarding your sda1 drive.
   If you want to identify which is your primary partition
   Run > sudo fdisk -l
3. Run > sudo fsck -yV /dev/sda1

fsck - file system check; you can read more about it by man fsck in terminal.

After that, restart your computer.
Your file system is repaired.