Lenovo ThinkCentre A55 8705 Hardware Replacement Manual page 28

10. Press down on the metal latch 2 and pivot in the drive cage into place and
11. Connect the power and signal cables to the hard disk drive.
12. Go to "Completing the installation" on page 26.
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Hardware Replacement Guide
9. Align the drive cage pivot pin with the slot 1 in the upper drive cage and
slide the hard disk drive cage into the chassis.
then slide it forward until it snaps into position.
Note: There are two arrows, one on the upper drive cage and one on the hard
disk drive cage. The arrows are aligned when the hard disk drive is in the
proper position.