SSD not reading on comp

Garrett__

Honorable
Aug 29, 2013
121
0
10,690
I have one Samsung SSD 120 gb and one WD black 640gb. I just installed a new SSD 250gb, Samsung, today and it still shows I only have two drives. the 120gb and WD. How do I get my computer to read the new SSD? the 120gb has my OS on it and 640gb is storage as of right now.
 

Garrett__

Honorable
Aug 29, 2013
121
0
10,690
OKay realized the sata cable wasnt plugged in all the way. So my BIOS sees the SSD and and all my other ones, but my OS is still not picking up the new one. Still says I have two drives.