The Bios can be entered if F2 key (on my S7 392, is the Fn key and '2' at the same time)
done when the 'ACER' screen flashes..... If the Bios is 2.08 or lower, there is a battery issue. The 1st fix is to tighten the center (hinge side) screw (TORX 6 driver needed)
The next try is to start in...