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1. Pre-Removal Instructions Before removing the First Removal:
2. Establishing image.
3. Locate the cover latch at the side of the chassis. Pull the cover latch upward.
4. Pull the cover upward to a 45 degree angle and remove it from the system.
5. Complete.
1. Pre-Removal Instructions Before removing the Second Removal:
2. Establishing image.
3. Gently pry the three front bezel retention clips away from the chassis.
4. Rotate the bezel away from the computer to release the hooks on the opposite edge of the bezel from the chassis.
5. Complete.
1. Pre-Removal Instructions Before removing the Third Removal:
2. Establishing image.
3. Remove the data cable(1) and power cable(2) from the back of the optical drive.
4. Lift the blue tab and slide the optical drive inward to remove from the system.
5. Remove the optical drive from the bracket.
6. Complete.
1. Pre-Removal Instructions Before removing the Fourth Removal:
2. Establishing image.
3. Remove the data cable(1) and power cable(2) from the back of the optical drive.
4. Slide the drive cage handle toward the back of the system into unlocked position.
5. Rotate the drive cage upward using the handle and lift the drive cage free of the chassis.
6. Remove the data cable(1) and power cable(2) from the back of the hard drive.
7. Remove the drive cage from the system.
8. Complete.
1. Pre-Removal Instructions Before removing the Fifth Removal:
2. Establishing image.
3. Press the two retention clips inward and slide the hard drive bracket from the drive cage.
4. Flex the hard drive bracket then remove the single 3.5" hard drive or two 2.5" hard drives from the bracket.
5. Release the four screws securing the 2.5" hard drive to top of the hard drive bracket.
6. Release the four screws securing the 2.5" hard drive to the underside of the hard drive bracket.
7. Complete.
1. Pre-Removal Instructions Before removing the Fifth Removal:
2. Establishing image.
3. Press the two retention clips inward and slide the hard drive bracket from the drive cage.
4. Flex the hard drive bracket then remove the single 3.5" hard drive or two 2.5" hard drives from the bracket.
5. Release the four screws securing the 2.5" hard drive to top of the hard drive bracket.
6. Release the four screws securing the 2.5" hard drive to the underside of the hard drive bracket.
7. Complete.
The source of Original information is from Dell Support Website, here is the original link https://www.dell.com/support/article/en-ca/sln292000/optiplex-790-sff-removal-guide-for-the-system-cover-front-bezel-optical-drive-drive-cage-and-hard-drive?lang=en