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Wireless printer network security key

HP Recommended
Deskjet 2540
Microsoft Windows XP

I've set up my HP-Print-73-Deskjet 2540 on my laptop but I need a network security key which I can't find anywhere on the printer, on my PC and any of my searches. 

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HP Recommended


Do you have a router or are you trying to use HP WiFi Direct? (the HP-Print-73-Deskjet 2540 network by your printer)


If you do have a router, can you see the blue wireless light as solid lit or blinks?

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