I have just fit 5 MR16 LED lights in my bathroom as well as an LED driver. The lights are 4.5W and the driver supports 24W which is just enough (4.5 x 5 = 22.5)
When I turn them on, only 2 lights come on. Thought it was the bulbs so changed 3 with new ones. Now none turn on. I therefore took one out and now 2 turn on again. I'm thinking it's the driver not supplying enough power. Is this the right assumption?