Recover l505-s6951

Do you have recovery disks? If so, put in the one marked Disk 1 (as a guess) and boot from it. Follow directions. This will wipe your existing data.

You may have a recovery partition on the drive also, see the manuals for your model. That will also wipe your existing data.

If you mean something else by "recovery" you need to post some details about your issue.