When I click on my beacon to turn it on before APU start, it resets the entire Lighting and the ECAM displays tons of failures, after maybe a minute you just get the sounds as if you just turned on external power and everything is alright again. This was the first issue i had several times, then when i figured out that it goes back to being okay after a while i tried to taxi to my rwy and I couldnt steer at all, my tiller was moving, and my nosewheel was moving from the outside view but my plane was just taxiing straight