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I have Acer Aspire laptop with Windows 10. Recently I've installed Debian 9 in a different partition and everything went fine. The second time I tried to boot into BIOS I got a black screen with a dash on it.
Also I can't boot grub because Windows Boot Manager boots first (this is why I want to enter the BIOS).
Windows 10 boots just fine.
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Try this: Remove battery, unplug laptop, hold the start button for at least 30 seconds, then replace battery and plug in. If this doesn't help, then follow the procedures in article1, followed if necessary by article2.
– harrymc – 2018-08-17T08:39:57.367when you log into windows 10 is your computer set up for fast boot? if you are able to go through a normal windows 10 boot sequence then I would recommend going into windows 10 and disabling fast boot. This should give you the option to enter the bios by pressing a key instead of fast booting to your windows 10 log in screen. I had to disable this so I could get into my bios to boot from USB once. Hope this helps! – RickwhoPrograms – 2018-08-21T19:58:02.343