First of all remove the battery and the memory card from the phone. Use a hair dryer to warm up the battery compartment so as to warm up the set lightly. Now replace only the battery after about 15 minutes back into the phone and switch on. If the phone boots up and comes alive with the pad working, then reset phone to factory settings, connect your phone to PC to have a virus scan . Also now have your memory card scanned for virus, remove files and format.
Also if you can open the set to check for moisture or fault on the key pads and the front panel- printed circuit board. There cane problems with circuit breaks if moisture is seen due to corrosion.
If however the fault stays then you might have to contact the authorised Service to estimate.
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