Monte2002yl

My monte was having a blinker problem, sometimes they worked, sometimes they didn't. Just had to restart it if they went out but they would also come back on by themselves. So, my "mechanic" pulled the battery cable to reset the codes and now, it wont do anything but give me dash lights. Wont crank, no radio, no dome lights. The remote key won't even pop the truck or lock the doors. I'm hearing igniton switch to PCM to BCM. I had a remote start installed from Audio Audio years ago but that been working fine up till now as well but thats not responing either. Any idea's before I have it towed to the dealership for their in put?
Thanks. Lee Ann