I have an old computer with Windows 10 installed in Legacy mode. I think the motherboard is too old for UEFI. The computer runs perfectly with windows 10 (I have also checked that every key of the keyboard works) but I would like to install ubuntu 18 on it and I cannot access the BIOS. I can press del, F10, F8, F2, esc but nothing works.
It seems to be a problem similar to How to get into BIOS when USB keyboard is not powered and have no PS/2 ports? but the solution does not work for me (I cannot hear the three beeps). I have also tried to remove the cmos battery and to reset the jumper.
I can use advanced startup but in the advanced options I do not have access to UEFI firmware: there is no corresponding button for legacy mode. If I click "Startup settings", the computer restarts again (at that point I have tried every keys for getting into bios with no effect) and it gets me to a screen from which I cannot do anything. My keyboard has no action on this screen even if the screen says that F10 should get me to more startup options.
I am running out of things to try, do you have any clue on what may be the problem?
Edit :
- If I unplug the harddrive and plug a ubuntu usb stick I still cannot access the bios but the computer boots directly on ubuntu. I cannot install ubuntu from there since I have unplugged the harddrive
- I have no PS/2 port and I have try to plug the keyboard on every usb port