Ooh come on .... The fluecent tube of our bathroom mirror was broken. So my girlfriend bought a new one. Still didn't work. So it must be the starters. Nope they work. So I took the damn thing apart completely and ripped out the PCB and meassured every transistor, diode and capacitor. And even replaced one that gave some fishy values just in case. Still didn't work. Then I opened the side door of this mirror and found a switch that I must have switched off by accident ... Switched on: lights on 🤔🤗😌