Shoutbox

Does the brick itself have a voltage/current/power adjuster? Usually with universal adaptors, it's not just the right connector, it's also the right voltage/current settings. Laptops usually have a label underneath with information about what voltage and current the mains lead can supply without causing trouble. It's usually accompanied by a symbol that's two horizontal lines, like a long =, but the bottom line is dashed. Either that, or one like this image.

Edit: In fact, not just laptops: any electric/electronic device has this info.