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 .
Here is a video on how to replace the HDD: https/www.youtube.com/watch?v=AZsCGkyn8Xk
Beyond that, if the original one was damaged, you will have to install the operating system and any data you had not backed up somewhere else will be toast. Most computers come with a version of Windows preinstalled and either have a sticker with the product code on them or a certificate with that info in the documents that came with the computer. You'll need these, along with bootable media for the version of the OS you machine shipped with.