Household Electrics

One of my bedroom power sockets was 'buzzing' a while back, even when not in use - so i stopped using it completely since because there is obviously some problem with it...forgot all about it because it hasn't made any buzzing noise since. However, i am now looking to get the wall that socket is on re-plastered/decorated soon, My query/worry is that there is a underlying problem with the Electrics i should sort out first (a Tradesman once told me years ago, that there was a 'Live wire' in the wall (he was installing a phone-line/internet at the time and whilst doing something to the wall he fused the electrics and told me that there was a Live-Wire in the wall). I would be grateful for expert opinions on this situation. Thankyou.