As title really. All was fine until the other day, but last night I went to use it, and though the wire feeds fine when you pull the trigger, when you go to weld it seems to not move much/all, make a buzzing noise from the machine, and do just the odd sparky spatty shit bit of weld then nothing. Obv if the earth was shit it wouldnt weld either, but surely itd just feed out a load of wire wouldnt it? If the wire feed was fucked, why it feed ok into open air when i pull the trigger? Bastard thing!