My iphone suddenly lost its power and i couldn't turn it on. what should i do?

my iphone suddenly lost power and i couldn't turn it on.

All,
From personal experience, if the entire control for enabling WiFi was grayed out on your iPhone then you likely have a hardware problem.  Another indicator of a hardware problem with the wireless radio is if you go to Settings > General > About, and you see an empty entry fro the "Wi-Fi Address" property.
When this happens coincidentially with an iOS update it immediately makes us think that it's the fault of the new iOS when in fact it may have just occured at the same time by chance alone.
Take your iPhone in the the Apple Store and they can run a hardware test to determine if your wireless radio has failed.  My 4S recently had this problem and the Apple Store replaced it on-the-spot.  Just make sure to backup your iPhone prior to getting it serviced to make sure that you can easily restore it if you get a replacement.
Tim

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