Unfortunately, you only have 2 options left:
- Return the system to Acer for maintenance
- Disassemble the system:
- Remove the main battery
- Remove the NVRAM battery,
- “Turn on” the system (I.E. press the power button)
- reassemble the system.
This is not a Manjaro problem but a hardware problem and the reason my current Acer is the first and last system of that brand I’ll ever buy…