Hey !

thank you so much, I will buy a new hard drive.

but how can I plug it by myself?

And what about the old hard drive? will it be possible to save the data in it ?

thx, Elinor

To attempt data recovery, mount the drive in an external 2.5" case (see below for example) and attach it to a working system by USB.  Make a backup of what you can still read.

Then purchase TWO hard drives - one for the system and the other to keep in the case, for making backups as you go forward.

You will need something like this:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817392032

If you require information on removing the old and mounting the new hard drive, please post your system model number.

F2 at powerup - go into the BIOS setup.  It'll be something like Inspiron 3521, etc.

Hey,

what is system model number and where can I see it ?

thank you very much !!

Owner's manual has  the details about how to remove the hard drive

http://www.dell.com/support/Manuals/us/en/19/product/inspiron-15r-se-7520

GREAT ! Thank you very much :D