I have a DELL Inspiran laptop. Recently I had a problem my External Hard Disk is not detected.
So I followed the below steps,
sudo mount /dev/sdxn /mnt
I got a message "GPT table corrupted" so I followed this solution Fixing corrupt backup GPT table?
sudo gdisk /dev/sda
w
After re-starting the laptop I can't able to see the OS only blank screen is displaying.
Only I can see F2 and F12 key options
Help me how to fix this problem.
/dev/sda is very likely your local Hard Drive, not the external. So you might have destroyed the partition table on your computer.
You should boot with a Linux Live USB and run testdisk to recover the partition(s) on /dev/sda.
TestDisk is powerful free data recovery software! It was primarily designed to help recover lost partitions
Next time, you should first find out the proper name of your hard drive using lsblk or use a graphical tool that can fix Partition tables (e.g. gparted)
