[International / GSM] WIFI not turning on after 4.0.2 update

[janathan]

I have Nexus I9250. received OTA 4.0.2 update. since then wifi is not turning on. did factory reset, drained battery, even flashed 4.0.4 (from google developer website), still wifi not turning on.
btw also noticed the battery icon is always showing charging sign, even if its not connected to usb or charger.

any ideas?

Thanks in advance