Go to your BIOS and see if the SSD is listed in the boot menu. Take you old HD out ( or simply disconnect it ) of the computer for now. IF the SSD is not listed, see if your BIOS has a key to show all your HD's(SSD's). In my Asus BIOS, you press F8 and it shows all HD's(SSD's) and then I can drag any drive to the boot order list.