ok i have a laptop so i unscrewed the screw that held the harddrive latch down popped it up and the HD slid out, i unscrewed the hd from the holder put the new one in inserted it into the computer. Turned on computer came up with error messages like no info or something all that, then i took that hd out and put the old one back in the computer works mostly but the sound mouse on the computer and screen are messed up