I've tried on two threads now, third time might be the charm

Help, anyone?

Ihedinobi: . . . My zero/space button no longer works. It's the second time it's packing up. The first time I called on a technician and it began to work again without trouble. Less than one month on, it went dead again. I stay in Aba and tried the Nokia Care here @St Michael's Road this second time and was told, like I expected, that my phone was out of warranty. Then the guy who spoke to me called up a street technician to take my case. Since I didn't care to put my phone in worse trouble or repeat my first experience, I didn't do business.

My phone's a 723'zero'. What can I do to get the key functional again?

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