To change settings (boot order, virtualization, etc.), restart your PC and press repeatedly as soon as the Acer logo appears. (On some units, Del also works).
If you are trying to install a new OS and the drive isn't appearing: Enter BIOS using Navigate to the CSM (Compatibility Support Module) needs to be enabled or if you need to switch between modes depending on your installation media. for this specific model? Acer Veriton M200-H110 bios required Acer Veriton M200-h110 Bios Setup Download -