Sony computer User Manual

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Networking 
Why can't my computer connect to a wireless LAN access point? 
Connection availability is affected by distance and obstructions. You may need to move your computer away from
obstructions or closer to any access point you may be using. 
Make sure the Wireless LAN switch on the computer on. 
Make sure power to the access point is on. 
Make sure the access point is displayed in the Available networks window. 
Make sure the encryption key is correct. 
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