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Several possible reasons. First, of course, is that the wireless signal is not there -- you're out of range. Or your wireless card could be turned off -- the wireless light is often a button that turns the wireless networking on and off, or there's a keyboard combo (often Fn/F2) that turns it on and off. Or the wireless access point could be set to not broadcast its name (SSID disabled) -- you need to know the name already, including UPPER and lower case, before you can tell your computer to connect. Or the standards are different: an 802.11n network access point may not see an 802.11g computer, or the computer may be running an out of date variant of the protocol, or the access point may be. And of course the network card itself may have failed; they are built cheap, and surprisingly often the transmitter part burns out.

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13y ago

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