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| [* black] ***Step 1. Open the computer protective case.*** | |
| - | [* black] First power off the laptop and turn the back of the computer up and you will find there are ***11 screws.*** |
| + | [* black] First power off the laptop and turn the back of the computer up and you will find there are ***11 approximately 5mm phillips screws.*** |
| [* red] Use a screwdriver to unscrew the screws on the back of the computer and open the back of the computer. Because the back shell of the Dell computer has a lock design, the ***three screws below cannot be unscrewed***, as long as the screws are screwed to the maximum and slip with some sliding sound. | |
| [* icon_caution] In addition, opening the back cover of the computer can be a bit laborious. You can use a hard object to pry it through the gap or force it from the air vent. |