I picked up my provari today and it would not fire my carto tank. I have only owned it for a couple of weeks so I'm new to this. I made sure it was on then proceeded to the ohms reading and it had an LO showing. I assumed the carto was bad so I drained my tank and punched a carto and refilled. I tried to fire the new carto and it would not fire. It was showing the same LO reading. I tried to remain calm and proceeded to put on three vivi novas and another cartomizer with the same resuls. The battery was reading 4.0 but I decided to put a fresh one in anyways and it is now working fine. I briefly searched the forum for this issue and I have found some posts with different feed back. What happened? I guess I need to download to Provari user manual from home because for some reason I cant access it from work.