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Hi, today I realized that the battery tab was disappear in the Energy Saver pane: Before I have like this: In the status bar the battery percentage was displayed correctly, but at "power source" ("alimentazione" in the picture) show "power adapter"(Alimentatore di corrente) and not...

Hai to all, during this weekend I've installed OS X 10.9.4 on my laptop probook 4540s. All works fine, the only problem is the wifi card (Ralink is not supported). Now I want change the wifi card with a supported model... but sincerly I don't have understand what is the best model with wifi +...