The Unified Extensible Firmware Interface BIOS (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI is a replacement for the older BIOS firmware interface present in all IBM PC-compatible personal computers

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ASRock UEFI Setup Utility No option to disable secure boot

I want to downgrade my computer from Windows 8.1 to Windows 7. I originally had Windows 7 on my desktop, then upgraded to Windows 8, then Microsoft basically forced me to upgrade to Windows 8.1. I was ...
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50 views

Can a computer that uses EFI/UEFI rather than BIOS run a real mode OS?

Title says it all: could I get away with installing a real mode OS such as MS-DOS on a EFI-based computer? I understand that EFI-based computers still use "BIOS emulation" for compatibility reasons, ...
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41 views

How to install Windows in a fresh formatted hard drive?

I was having problem concerned with dual boot of Windows and Ubuntu because I had Ubuntu already installed in my system. Well, there was something wrong with my boot/efi partition's VBR or my hard ...
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20 views

Hardware issue with motherboard BIOS resets

I have a motherboard AsRock 970 Extreme 4. BIOS defaults again and again and it doesn't store settings which I set. I tried to change jumper to Clear CMOS position and after that change it back to ...
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47 views

Acer Aspire keeps rebooting when bootable USB inserted

So I have an Acer Aspire V5-131 and long story short (really, it's a long story!), I decided to do a complete wipe of the HDD (using dban). So right now the HDD is absolutely wiped, there's nothing on ...
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25 views

Using multiple OS's on a UEFI secure boot system

I wanted to install Ubuntu on a windows 8.1 system but I don't want to use GRUB or replace my current boot loader. Can I install multiple OS's without showing a prompt to select An OS unless I press a ...
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33 views

Black margins around the image on monitor during system boot up

I have recently purchased a new video card. After i switched to it, my monitor shows black margins around the image near edges of the screen during system boot up. Once OS loads a proper driver for ...
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1answer
64 views

Normal ISO to UEFI bootable ISO converter?

It's easy to Google Windows 8 password recovery tools. However, the PC I'm working on right now doesn't support legacy boot and can only boot from GPT partitioned USB sticks. I'm using Rufus for ...
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13 views

UEFI boot into last used os

I have windows 8.1 side to lubuntu. There is option in uefi to boot by default to the last used operating system? (I don't want to use grub or windows boot manager)
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Access UEFI BIOS settings

I have a NEC ultrabook with windows 8 installed, and with UEFI bios. I was told that in order to access the BIOS settings I have to press the F2 key as soon as i power it on, however it doesn't ...
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113 views

Why can't I install Windows 8 on an UEFI machine from an MBR based USB disk?

Just tried to install Windows 8.1 on an UEFI machine/GPT disk. I used a 2 TB MBR-based USB drive to contain the installer (FAT32 partition with Windows 8.1 install files). I got as far as selecting a ...
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36 views

AMD Radeon video card/display only works with UEFI Fedora

When I was using my onboard graphics, Intel HD4600, I was able to set up a dual boot on my SSD with a legacy BIOS Windows 8.1 64-bit installation and legacy BIOS Fedora 20 64-bit installation. I put ...
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20 views

How can I tell if a Windows 8.1 machine has 'full' UEFI?

I've seen a Windows 8.1 machine that has a MBR format drive and a 'Legacy' BIOS, and it has fancy graphics that look like UEFI. If I have a GPT format drive is it still possible to have the old style ...
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119 views

How to recover Windows Boot Manager after a Mint installation gone wrong

Yesterday, my cousin wanted me to install Linux Mint onto his Windows 8 Lenovo laptop so he could dual-boot Linux Mint and Windows 8 so he could get some hands-on experience with Windows 8. I've ...
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2answers
5 views

Difference between UEFI and BIOS architecture

How does the UEFI offer an advantage over BIOS architecture? Why is it so difficult install Linux(read Ubuntu) as a dual boot option on a UEFI Windows 8/8.1 PC? I say it's difficult because of this ...
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69 views

How to add EFI entry by efibootmgr?

I installed stand alone Ubuntu on my laptop by formatting the HDD. Now HDD is not in my EFI menu. From a Live USB environment, I added the EFI entry, even by chroot. However, the EFI menu is reset to ...
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52 views

Installing Windows 8 on SSHD. Drive not recognized?

I've been trying to install Windows 8 on a new Seagate 1TB SSHD that I got. I managed to make a UEFI bootable USB drive, and installing Windows 8 went fine. But then after the installation it tried to ...
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27 views

In Windows 8.1 what are the differences between UEFI, and the UEFI style Legacy BIOS?

When using Legacy BIOS (and MBR format disc) the BIOS still looks like UEFI, has a mouse pointer, and appears to function in a similar way. I believe that you can only use Secure Boot with UEFI on a ...
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73 views

Is UEFI more or less vulnerable than Legacy BIOS?

Is UEFI more secure than BIOS on a Windows 8.1 machine? Is UEFI vulnerable to malware in ways that Legacy BIOS is not? Is it correct that UEFI can connect to the internet before the OS (or ...
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86 views

Is a hybrid Linux USB-Stick for UEFI & legacy BIOS possible?

my idea is to create an USB-Boot-Stick with Lubuntu that is able to boot on an older BIOS Laptop and an newer UEFI Systems. This would be quite easy, when the Stick would be setup as a legacy boot ...
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19 views

Third monitor Windows 8.1

My current setup has two monitors running off of crossfired AMD Radeon 7870's, I am looking to add a third monitor for non-intensive usage. I've been led to believe this is possible by changing a ...
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45 views

How to change from UEFI to legacy without reinstalling Windows?

The machine has UEFI enabled. I can't boot anything except Windows; No bootable USBs. I have to change it to legacy mode, but Windows 8 won't boot in legacy mode. So the only solution I can think of ...
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Reinstalling Windows 8 on a tablet

I got my hands on a Samsung XE700T1A, one of the ones handed out at one of the early Windows 8 BUILD conferences. It's been upgraded from Windows 7 and recovered from an image at some point, so there ...
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48 views

Chainload a partition using GRUB2 on a UEFI system

I am trying to install Windows 7 on my laptop which came with Windows 8, but it doesn't have a disk reader and I don't have a USB drive big enough for me to write the Windows 7 ISO to. I wrote the ...
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225 views

How to partition hard drive from MBR to GPT for Windows 8.1 UEFI install

I just bought a new HP notebook (ProBook 450 G0) and it came preinstalled with Suse 11 Enterprise. Now this is the first time I've owned a system with an (U)EFI and I don't know how things work on ...
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163 views

How to partition hard drive from MBR to GPT for Windows 8.1 UEFI install

I just bought a new HP notebook (ProBook 450 G0) and it came preinstalled with Suse 11 Enterprise. Now this is the first time I've owned a system with an (U)EFI and I don't know how things work on ...
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2answers
167 views

How to configure dual boot NixOS with Mac OS X on an (U)EFI MacBook?

I could not find any description of configuring dual boot of NixOS and Mac OS X on an (U)EFI MacBook. I am willing to experiment, but i would like to know at least that what i will try is supposed to ...
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158 views

New Mainboard Z97-K and OS is only bootable with the usage a LiveCD

I have a new Mainboard, CPU, Ram for his PC - a Asus Z97-K other components like PSU, SSD, HDD are taken from the old Bios based Core2Duo PC The OS is Linux Mint 16 and the LiveCD also - there is no ...
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30 views

Ubuntu 10.04 Installation Replacing Windows 8 2TB Hard Drive

As a point of reference and documenting for the Greater Good, I thought I'd post something I've discovered. After searching forums for days, I haven't come across this specific tip that might be of ...
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219 views

Want to buy Asus H81M-PLUS motherboard and i3-4150 CPU; how to make sure it'll work?

I want to buy an ASUS H81M-PLUS mainboard and an Intel i3-4150. The CPU is an Haswell Refresh CPU, but the mainboard needs a newer BIOS version to support the CPU. I expect it won't be shipped with ...
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93 views

Monitor only works if Legacy BIOS (CSM) disabled?

I have an Asus Q550-LF computer running Windows 8.1 Enterprise. It has a MiniDisplayPort output which is connected to a MiniDP to DVI adapter. I discovered that my monitor was not working the same day ...
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131 views

How to boot from 3TB HDD?

I just bought a new HDD of 3TB (not yet shipped). I didn't know that size is normally not supported to use it to boot OS. I learned I need a computer that supports UEFI so that I can install windows ...
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hp probook white screen with error cancel image and boot to next boot order

I bought HP Probook 440 G1 with windows 8 Pro. I am a ubuntu user so I wanted to install ubuntu with Windows side by side. I tried to boot it from USB or DVD ROM but was unable to do so. Then from ...
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How do I get my system to find a “buried” MBR?

Following a botched Linux install, my Windows 7 install can't find my MBR normally. It's in there -- somewhere -- and I CAN access it if I use F12 during boot to access the mobo boot options: Note ...
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Installing Ubuntu 12.04 x64 in MBR

I wanted to install Ubuntu 12.04 side by side with Windows 8.1 in my SSD. Windows is already installed in MBR, even though I have a UEFI machine. And so I used the legacy Bios. I have confirmed that ...
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1answer
119 views

Adding X.509 certificate to UEFI secure boot database?

I have recently installed Fedora 20 on a custom desktop PC with a ASUS Z87-K motherboard. Given some commonly known bugs, I have installed the NVIDIA proprietary driver for my GeForce 630, and ...
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62 views

Restore boot without formatting (UEFI)

I have a problem and I would not format more my poor HDDs. Hardware situation: Motherboard Asrock 970 Extreme4 (UEFI) HDD1 (/dev/sda) -> Recovery | EFI Partition | Windows 8.1 HDD2 (/dev/sdb) -> ...
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108 views

Beep-Codes definition for ASUS motherboard

I'm having a hardware failure when booting then I need to know the exact beep-code definitions for this model: Asus M5A97 LE R2.0 Someone could provide me the beep-codes of that motherboard?, I ...
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1answer
127 views

Restoring Windows 8.1 is blocked by UEFI

I accidentally wiped my Windows partitions while installing Ubuntu, but fortunately, I did a complete backup before trying to install it. The laptop is a Yoga 2 Pro, if that helps at all. The ...
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1answer
203 views

Fix Windows 8 bootloader after converting MBR disc to GPT

I bought a new MoBo, processor, and some 3TB HDDs last week and am currently setting up a clean installation of Windows 8 on the machine. The MoBo is an Asus RoG Maximus VII Ranger (What?! It was ...
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1answer
345 views

Error 0xc000007b when trying to start \EFI\ubuntu\shimx64.efi (Ubuntu) through Windows 8.1 Bootmanager on an UEFI System

Error 0xc000007b when trying to start \EFI\ubuntu\shimx64.efi (Ubuntu) through Windows 8.1 Bootmanager on an UEFI System EFI Entries During Ubuntu Setup, Ubuntu automatically created an EFI start ...
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1answer
219 views

Installing linux on a macbook pro - boot broken

So I tried to install ubuntu 14.04 on my macbook pro (completely replacing OSX). I had refit installed, but not it seems gone. And every time I boot, the PC can't find any OS. I tried using ...
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2answers
494 views

Ubuntu 14.04 installation on Asrock H77M UEFI, dual boot with windows 8.1 already installed

As the title says, I need to install ubuntu in dual boot with windows 8.1 on my home PC. I knew that with UEFI partition table was written in GPT, but I found that the partition table on my hard ...
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192 views

Shortcut to UEFI firmware settings on Windows 8

I often switch out of Windows 8 to Linux on another partition, but it's awkward : Windows + I Shift + click restart click Troubleshoot click Advanced options click UEFI firmware settings and only ...
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2answers
637 views

Cannot boot Windows 8 into UEFI mode (CSM only)

I have a laptop (pre-installed Win8) that has been through numerous dual-boot configurations. At one point, I had removed everything and ran Linux Mint as the only OS. Eventually, I decided to remove ...
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3answers
140 views

Two Windows 8 installations on separate hard drives - failure to boot

My motherboard supports UEFI and I have 2 disks on it. I did the following steps: a) Installed Windows 8 via USB on hdd1 (Let 's call this WinA). Worked fine, booted fine multiple times. b) ...
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365 views

This should be simple: “winload.efi missing or corrupt” yet neither. Win8.1 not booting

I have a desktop PC that was running Windows 8.0 from a slow HDD. I unplugged the old drive and installed a new SSD and Windows 8.1. Once I got it running, I unplugged the SSD and plugged the HDD ...
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212 views

'UEFI boot source (windows 8)' and 'Legacy source (RHEL 6)', dual boot issue, after installation

On new system where windows 8.1 installed already, I have shrieked the partition and tried to install RHEL 6. But the DVD is not detectable (may be because it is not supporting UEFI boot source). ...
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158 views

Unable to access UEFI settings on Lenovo

I have a Lenovo G580 on which I installed Windows 8 and several Linux distros which have messed with my booting. The last I used was boot-repair tool. I have an EFI partition on sda2. The Grub load ...
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55 views

Is it possible to bypass the 5-second delay in EFI shell?

Due to my unusual hardware configuration, i am forced to set two PCI registers using the mm EFI command before being able to boot Windows. Right now i have a build of the EFI shell (my mobo does not ...