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switch off your mobile and then switch it on again if not done renew your n72 software
first step,you should update your phone's firmware and then clean the keytone
.If nothing have changed,you can change the flexible,check the keypad track and
check the keypad ic,replace if needed. And Finally,rehot the CPU or replace it.
I have encountered this kind of kpad problem before.only power button works.i thought it only a program,but i found the main problem is in the sidekey only.you need to disassemble your phone carefully and clean the sidekey interface.remove the membrane and clean sidekey interface.100% tested.If you have enough money to buy a new keypad flex,then you can replace the keypad flex.
I suggest you try resetting the phone through the settings menu. IF that does not work, try turning it off, removing the battery and SIM card for a minute or two, and then putting everything back in. If that doesn't work either, perhaps they keypad has moved slightly inside the phone cradle, thus making the phenomena you've described. In that case, I suggest taking it to a lab, where it will be opened, be placed back to its correct position - or they keypad itself might be faulty, thus replaced.
you must have internal problems on your phone...
if you can open your phone... ckeck its keypads inside probably its lost its connections inside...
if not just visit your trusted service center...