I have a Lenovo ThinkPad Edge E545 that recently had a strange problem. Even though it was connected to a wireless network, it couldn't communicate with any other machines there. It couldn't get DHCP, but all other hosts on the network could. Windows network diagnostics did nothing; no amount of fiddling with the adapter helped.
A person I was working with had seen something like that before. He suggested that I fully power the machine off by unplugging it and removing its battery. Interestingly enough, that worked. I can't imagine how a network adapter could get so messed up, but this trick might be helpful on other models too.
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