Acer V7-751, 500G HD, Windows 8.

I changed the BIOS settings from UEFI to Legacy BIOS when I was working on a problem. Now I can't even get into the BIOS (F2) or change the Boot Order (F12). All I get is an error "Operating System not found". I can boot with a Win7, Win8, or Win8,1 DVD. I suppose I could boot with just about anything else bootable as well.

The problem seems to be caused because it's set to Legacy BIOS and Secure Boot Manager as default #1 boot device. Legacy BIOS can't boot a Win8 drive that has been installed under UEFI (Secure Boot). I have to change the BIOS back to EUFI to boot the WIn8 drive, but the only way to change the BIOS is from within Win8. It's a very flawed way of doing things but it's the way it is.

Does anyone have any suggestions that they KNOW work. Please don't Google answers. I've already done that. And please (please) don't tell me to power on and press "F2" (or any other key) to go into BIOS. If I could do that I wouldn't be posting.

Once again, I cannot get into the BIOS without going into Windows first. I cannot load Windows because the install was done under UEFI. I cannot change from Legacy to UEFI because I can't get into the BIOS.

If you are unable to access the BIOS, you need to contact the computer's manufacturer.

• Marked as answer by Kate LiMicrosoft contingent staff, Moderator Wednesday, January 08, 2014 2:20 AM

I did. Do you anything more useful to add? :-)

Hi,

BIOS is not responsible on Windows and Microsoft, but a de facto standard defining a firmware interface.

To contact manufacturer is the best way.

Thanks for your understanding.

Hi, did you manage to find a way to access bios? I'm having the same issue not being able to access bios or boot Windows.