I'm currently using linux mint 20.1 and when I try to get to the bios the screen just goes black. I also can't get to grub. I tried to edit some grub files but it didn't work. I need to access the bios to boot from an usb drive. Any ideas?
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Try to disconnect any hard drive and usb disks you have to see if you the bios screen still goes black. A black screen is not how it should works, also make sure that you used the right key to access the BIOS. What's your motherboard or PC ? Also, if you get to the BIOS, try to set a bigger timer for POST so you can chose your boot device. – X.LINK Jan 20 '21 at 22:12
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Make sure UEFI fast boot is off. UEFI fast boot, skips the old BIOS Power-on self-test (POST), assumes no changes to system. Power shutdown and then "cold" boot normally allows for access to boot keys as then it does the scan of hardware. – oldfred Jan 20 '21 at 23:11