Lenovo B50-45 X Kom

I bought a lenovo b50-45 but it came without an optical drive. what is the model number(s) of a drive that will work in it? it has a plastic blank in it now so i will also need the plastic front part with the button.. Learn more about the lenovo b50-45 laptop, an affordable business laptop with a 15.6" hd display, amd processing and enhanced multimedia features. Impossible to find the key to enter the bios on the pc b50-70 „07-02-2015 04:10 pm - edited „07-02-2015 04:10 pm hello i do not find the key to enter the bios on the pc i have b50-70 essy