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Pavani Sharma, according to your explanation, there is two possibility of problem :1st hardware problem all keypad had a water damage that why it is not working you need to clean main board with alcohol and let it dry for 2 hours, if you don't know how to do it show some official repairer.2nd Software problem maybe your keypad is working properly without sim or with sim but is is freezing after some time. for this you need to do hard reset, for he hard rest first switch off device and then press and hold * 3 and green button and then power on wait until shows insert sim, if software problem persist then show some official repairer to fix for you.
I also have the same problem... Nokia support center used some software updater through which you can switch on your mobile without using power button. Keypad IC might have been damaged due to which the power button is not working.
under tools there is a record option. erase all things that have been recorded. the button on the top screen on the right hand side allows you to record phone calls. You have probably been hitting it on accident and recording calls and such. Let me know if this works.
it could be that your phone could have goten bricked which means that it locks your phone aka virus its very comen with all this 3 party software or the software made your phone have a system error makeing you have no way of fixing it phones are hard to fix not like a computer so your phone maybe done.