You can enter the BIOS setup on most Acer and Dell PCs by pressing the F2 hotkey just after turning them on. Press the Acer BIOS key, F2 or Del, to access the BIOS setup window. In this case, you can run SFC command to check and repair corrupted system files. A complete guideline is here: 100MB files for FREE! 1.
To fix this problem, you should power down your computer and open your computer case. a) changed Boot Mode to CSM Boot, and back to UEFI Boot. We are honored to have Leostat in the Acer Community. The Windows USB Tool will not make a UEFI bootable USB drive. When you do set no bootable hard drive or device as the first boot item in BIOS interface, the PC will find no bootable partition/device and cannot boot up. How to fix no bootable device acer laptop
