This video will help you troubleshoot why your Acer laptop computer is giving you No Boot Device, No Bootable Device, Bootable Device Not Found, Etc errors. It will show you how to address multiple possible causes of this issue. If, after completing the steps shown here, your issue still is not resolved, then try a new install of Windows 10 as seen here; https://youtu.be/bIlW4im-tr4. If the install fails, it could be due to a bad Hard Drive. Replace it as seen here; https://youtu.be/tNp5Kbo9uHg. Then you would have to install Windows onto the new one.
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Related Video Links:
How To Replace Hard Drive
How To Access CMOS Battery / Perform BIOS Reset
How To Install Windows 10 for Acer Computers
Q: What if I cannot locate Legacy vs UEFI or if changing them did not work?
A: If you cannot locate the options to switch between or if switching does not work, then skip that step and continue with the rest of the video 🙂
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From: PC Monkey