This is a good opportunity to plug in the SATA Data cables between any storage drives and the motherboard as well.
Next up, take your SATA power and connect it to any storage drives. If you happen to have something mounted onto the front of the case, r un this SATA power cable through the PSU shroud, appropriate grommets or holes, and into your front-mounted 2.5-inch drive. This is a good opportunity to plug in the SATA Data cables between any storage drives and the motherboard as well.