Sony PCG-GRX570 Manual

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I cannot access the Internet. 
Make sure the Wireless LAN PC card is properly inserted into the PC card slot on the left of the notebook. 
Check if your notebook and the access point are connected to one another. 
Check the access point settings. Refer to the instructions supplied with the access point. 
Move your notebook away from obstructions or closer to any access point you may be using. 
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