hi i have a toshiba sateillite p75-A7200 and one day my boyfriend got mad and hit the laptop and then after we wanted to turn it on it would power on screen looks great ..but it shows up on the screen that there is "no bootable device please restart system " so i bought a new harddrive for my laptop same exact one too but theres no memory like i said its brand new and im having trouble to install the hard drive into my laptop please im seeking for help .