I've got a new flushmount light fixture that I'm having trouble wiring up to the ceiling electrical box. From the box, there are two pairs of blacks and whites, ie: four wires total, two blacks and two whites. The light fixture has two bulbs and therefore also two pairs of blacks and white, again four overall, plus a ground. The light is controlled by a single switch, that doesn't control anything else. This should be simple, but I've tried everything, please help.