Looking for advice, please! Converting MR16s with transformer to GU16 lamp holders wired into mains. Done it several time before without problems but this time when converting five downlights in kitchen, the whole circuit stopped working. During process the second bulb (halogen) did blow when I switched electricity back on for a test. Thought it might have blown the dimmer switch. Changed that for LED dimmer but still no lights. Breaker hasn't tripped, either. As lights are presumably on a radial circuit could there be a loose wire which is breaking the circuit? Thanks for any advice.