Default help me. wifi greyed on my device

my htc one xl ( evita ) running Cynogenmod 10.2 . everything work well except wifi, wifi icon change to grey color, sometimes change to blue, but it isn't work. i try change router, other wifi point but it still, and i didn't post my question to this link : to ask how to flash this rom, my device failed when flash CynogenMod 11. could you teach me how to flash it and fix my wifi problem?