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If your wifi isn't working, it might just be a loose connection to your wireless card. Follow this guide to replace your wireless card.
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            Slide the switch to the left until the release clicks. 
 
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            Remove the two 5mm Phillips screws on the hard drive cover using a Phillips #00 screwdriver. 
 
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            Pull up on the two plastic flaps on the hard drive enclosure to remove it. 
 
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            Gently lift the ribbon cable away from the hard drive enclosure to free the drive. 
 
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            Locate four 2mm Phillips screws on the side of the enclosure and remove them using a Phillips #00 screwdriver. 
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            Slide the hard drive out of the enclosure to complete the removal process. 
 
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            Locate the wireless card and the two wires attached to it. 
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            Using a plastic spudger tool, carefully lift up on each wire connecting the card to unsnap the connectors. 
 
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            Locate the 2.5mm Phillips screw on the corner of the WLAN card and remove it using a Phillips #000 screwdriver. 
 
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            Upon removing the screw, the WLAN card will pop up. Keeping a natural angle, slide the card out of the slot. 
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            The card is now free from your computer. 
 
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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