Problems transfering my Ardunio from being power from laptop to 240V mains

Hi all,

I've designed a touch design lamp and have completed all of the programing and circuit design up to now. With the project getting close to the end I wanted to power the lamp/Arduino via the mains and this is where the problem begins. It works fine when being power by my laptop/desk top Pc, but when I connect it to the main the lamp seem to have a mind of its own and doesn't work correctly. Does anyone know what the problem is? How to solve it?

Thanks

You're going to have to provide schematics of the before and after circuits