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After reading this lengthy article on UEFI and the recommendation to disable CSM for dual boot setups I went ahead and did so. Now I can't boot into UEFI-BIOS (normally pressing either Delete or F2 on boot).

A bit more info> Part of the problem may be my misunderstanding of what constitutes a 'dual boot' system.

Right now I have Linux and Windows, but they are each on totally separate SSD's and I only switch between them via the BIOS on boot. So technically I believe I have a single boot setup and shouldn't have messed with CSM.

To make matters worse, I attempted a BIOS firmware reset thru the Windows rescue menu, holding down shift on restart. Not sure what I did but didn't manage any BIOS reset or update and when rebooted get no video signal, just a black screen.

How do I get back into UEFI BIOS?

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  • You disabled fast boot? or CSM? because these are 2 totally different concepts! Dec 10, 2016 at 3:27
  • Just don't worry ok? In my opinion, you haven't lost any files, you reset your firmware settings to default, and now EFI boot is disabled (I believe you have a CSM BIOS rather than a Modern EFI BIOS) Same happend to me, You just need to get into your BIOS and enable EFI boot again, and there are ways to do that. Dec 10, 2016 at 3:36
  • thanks, in my journey into Linux installs now feel I've broken everything that CAN be broken. Yes I know fast boot & CSM r 2 different things.Still need to figure out how to reset, or reinstall my UEFI firmware. Have done it before, but think that required first booting into UEFI! Bit of a chicken and egg problem. At least have resolved the black screen, my MOBO thinks I have 2 monitors when I have one...more digging. Maybe a way to reset UEFI thru command line? Or a switch on my AsusX99II-A MOBO?
    – Bachalo
    Dec 10, 2016 at 13:59
  • wmic bios get /format:list give s brief summary of BIOS settings but nothing detailed and nothing CSM related
    – Bachalo
    Dec 10, 2016 at 14:08
  • also tried this method to enter BIOShttp://www.dell.com/support/article/ca/en/cabsdt1/SLN143038
    – Bachalo
    Dec 10, 2016 at 14:15

1 Answer 1

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OP
I checked MOBO manual for ASUS X99A2- solution was to short 2 pins for 10-15 seconds after first shutting down and removing power cord. If someone knows of a software only solution...

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