Galaxy Nexus- unresponsive, no wifi

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http://forums.androidcentral.com – I have using my Galaxy Nexus for the past year and upgraded to Jellybean 4.2 around 3 months back. I've had no complaints at all and was very happy with the phone. Since last two days my phone suddenly either - goes unresponsive in locked/or unlocked state. i can hear notifications alert or phone rings but cant do anything. Even the hardware power switch does not bring the screen on. Works only after a battery reinsert. - Does not detect any wifi signals, but works fine off 3g - when its working, it has a 3-4 sec delay between me doing something on the touch screen and it beeing reflected. (HowTos)