If you do not see an extra SATA power cable connection from the PSU or MB then you could always purchase a splitter as shown here at Amazon.
I am trying to add another 2.5 HDD however I am confused with power cable. I don't seem to find option for power cable. I see there is a slot open for SATA cable. what is the recommended approach here for adding second HDD? Pls advise.
power cable for adding second hard drive