You turned off the built-in graphics card in BIOS, but now you're seeing a black screen.
You turned off the built-in graphics card in BIOS, but now you're seeing a black screen.
Disabled the built-in graphics card in BIOS on your laptop, but the screen remains black. I attempted to replace the CMOS battery, yet the issue persists. The device is an Acer N15Q1 i3 5005u.
You kept the CMOS battery disconnected for several minutes after removing the main power source, then reinserted it before reconnecting the main battery.