New HDD "is failed" what have i done wrong?

Hello,

I bought a new hard disk (MK5076GSX) for a Toshiba Satellite C660 and tried to instal it and boot the laptop - no joy.

The old hard disk was not working well - I backed it up and bought new drive.
couldn't get it to work. sent it back and another replacement came back in post

Just installed it this evening and went to boot up

i know I probably have to configure the hard disk - but don't know how to do that.

it entered boot menu and stayed there
i went into bios and saved and exited to get the computer to boot up.

got a flash of the toshiba screen - all ok so far.
then a few flashes of normal boot messages as it tried to boot
then it came back into boot menu with message at the bottom:

[ HDD/SSD TOSHIBA MK5076GSX ] is failed

Am I doing something wrong?
or is it another faulty drive?

help please folks (by the way in case it was not clear - I haven't a clue what i'm doing!! :-) )

regards
francis