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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RAID 1 accidentially booted in AHCI mode

I have two Samsung 840 EVO SSD's in RAID 1 (Asus P87-Pro and Intel Controller) with Windows 8.1 Pro on it. After a BIOS update, apparently all BIOS settings was reset, which apparently changed the ...
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16 views

I can't access BIOS anymore on my tablet

I have an Onda v116w dual OS tablet. Last week I accidently deleted a Windows boot manager file while trying to reset the boot order. Ever since I’ve been struggling with my UEFI settings to convince ...
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23 views

Doubled entries in EFI list

while ago I wanted to install Ubuntu alongside my Windows 8.1. I had some problems with it as it was my first encounter with UEFI and some of the online tutorials were a bit confusing. However after ...
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0answers
20 views

Can't enable CSM mode or Fast Boot

I have an ASUS UX302LA laptop and its been working great. A little while back I was loading different OSs on it, and had to disable Fast Boot and Secure Boot Control, and enable CSM mode. After a ...
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1answer
43 views

Laptop reacts to power cord as if it was the power button

I have a Lenovo Thinkpad Carbon X1 which has started to misbehave recently. The basic symptoms are that it Can't be relied upon to start when pressing the power button (not sure if it never does, or ...
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0answers
26 views

How to 'legally' obtain EFI Shell? [closed]

Many systems firmwares have an option for locating and booting into UEFI shell but there isn't a single place where to obtain one officially or is it? I have an Asrock B75M-GL with a x64 cpu and yet ...
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1answer
19 views

Lenevo G580 Model 20157 can't open bios menu

I am facing problem in opening the bios menu by pressing the system rescue botton which bring up the CMOS menu under which there is bios menu where I can change the UEFI/Legecy mode or change the boot ...
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0answers
33 views

How to install Windows 7 to UEFI system?

I have a new HP laptop that came with Windows 8. I want to do a dual-boot with Windows 7. I have Home Premium x64. I disabled Secure Boot, and the laptop now will start to boot the Windows DVD but ...
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1answer
43 views

How to boot Windows from new hard drive

I just bought a new, bigger hard drive. Currently I'm running Windows 8.1 with a 1TB hard drive. I just bought a new 3TB hard drive and installed it in my computer. Everything seems OK and Windows ...
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0answers
16 views

How to boot Windows from new hard drive

I just bought a new, bigger hard drive. Currently I'm running Windows 8.1 with a 1TB hard drive. I just bought a new 3TB hard drive and installed it in my computer. Everything seems OK and Windows ...
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0answers
41 views

Access BIOS on UEFI-based computer

I'm having issues with some hardware, and I called the hardware company's tech support. The support person told me to make a change "in the BIOS, not the UEFI". He seems to think there is a way to ...
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1answer
53 views

Asus X99-Deluxe - Can only boot with the “Clear CMOS” button after cooler installation

It sounds like I have similar symptoms to this question, but this only started happening after swapping out a heatsink for a cooler. To be precise, the system will only boot if I press the clear CMOS ...
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1answer
29 views

HP laptop - DVD boot difficulties

Yesterday, I bought an HP ProBook 4330s. It had Linux on it. I tried to use a bootable Windows DVD to reinstall the system but it didn't work. I changed the priority in BIOS, the CD/DVD is first on ...
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0answers
58 views

Cloning a SSD using GPT not working (Clonezilla)

I am using Windows 8.1 Pro installed on a 128 GB SSD, partition-table is GPT. My Asus Mainboard uses UEFI and i installed windows 8.1 as a uefi installation. Therefore the first boot device is ...
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0answers
75 views

Windows 8.1 Re-Installation on Acer Aspire - Key Issue

On Acer Aspire V3 model, Windows 8 recovery partition could not complete a fresh installation. It kept stumbling on error; it seems corrupted though I check the disk for erros/bad sectors and did not ...
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0answers
18 views

Getting Dual-boot to work on (non?) UEFI system.

This is the first time I'm working on a Laptop with UEFI so bear with me. I'm gonna bullet-point this to make it quick: HP Envy 6 Windows 7 Preinstalled Default BIOS setting: Legacy Support - ...
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0answers
33 views

Cannot boot onto any OS after deleting Linux partition on UEFI system

Today, I decided to delete Ubuntu 14.10 from my computer. Everything was OK, I had created the USB recovery drive of Windows 8.1. After formating the Linux, I restarted. Sadly, I forgot to delete the ...
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1answer
60 views

Cannot access BIOS after installing a Linux distro

Some time ago, I went and installed ElementaryOS on my Samsung NP530U3C. After that, I could never access the BIOS again. Pressing F2 had absolutely no effect (neither any other common BIOS-accessing ...
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1answer
58 views

replace efi firmware with old legacy bios?

So I bought a new laptop with 64-bit windows 8 pre-installed, and in preparation for downgrading to win7 32-bit, i've been reading about EFI and MBR etc.. It seems like the firmware which boots disks ...
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0answers
49 views

Changed laptop BIOS boot settings - Black screen

Laptop concerned is an Acer TravelMate P453-M. Already asked the question on Acer forums, but maybe you guys can add more insight! I recently had a motherboard and HDD replacement on the laptop. I ...
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1answer
79 views

How do I convert an EFI System Partition into a normal GPT partition?

I had a Windows 8.1 that required a re-install. In the process, my 4TB secondary disk is now showing up in Disk Management as an EFI System Partition, with no volume. In DISKPART, a volume is shown, ...
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35 views

Go2Bios utility not proper working when trying to acces into bios

i have this motherboard, msi h97 gaming 3, now msi have go2bios an utility which gives the access to bios during a windows session. In a fairy way the system reboot into the bios, but when i click on ...
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5answers
263 views

Secondary Internal HDD Vanishes/Reappears Randomly In Windows 8.1

To clarify, I'm referring to entire disks disappearing, not just partitions. The PC in question is an HP Pavilion 2325DX. Both drives are variants of HGST. One is in the primary slot, the other is in ...
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2answers
143 views

Asus A53E Laptop in UEFI mode resets BIOS three times before booting

Working with an Asus A53E laptop. Enabled UEFI boot mode in the BIOS and installed Windows 8.1 x64 successfully last night. Now, today, when I start up the machine from cold boot, I can clearly hear ...
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98 views

How can I place /boot/efi on a different drive than / and /home?

I am trying to install Fedora 21 onto a relatively recent Toshiba laptop. Due to firmware problems, I cannot alter the existing EFI partition. Therefore, I need to install /boot/efi on external media. ...
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42 views

Windows 8.1 - doesn't allow me to boot into firmware settings

I have Windows 8.1 which is booted for sure in UEFI mode because of some reasons I'm booting with UEFI Gop and my inital windows resolutions is Full HD. This image: My BCD configuration: ...
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0answers
70 views

Restore hardware entries in UEFI from Windows 8.1

After a missuse of efibootmgr under Centos 7, I have deleted every boot entries in UEFI, including USB, CD-ROM, DVD. So I couldn't boot anything. I recovered Windows with the recoverer partition, but ...
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1answer
90 views

How to add UEFI image boot option in BCDedit?

I just installed FreeBSD on a GPT partition. On which is also installed Windows 8.1 and it's EFI partition with Windows Boot Manager. The FreeBSD installer auto-added another EFI partition with it's ...
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0answers
166 views

No bootable device found on new UEFI installation

I have just installed Fedora 21 on a new laptop I bought using the following partition scheme: GPT partition table +-------+-----------+------+------+------+-------+ | sda1 | sda2 | sda3 | ...
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0answers
165 views

Multiboot by UEFI boot manager for Win8.1, Mac OS X and Linux

I am trying to build a hackintosh and want to multi-boot 1) Windows 8 2) Mac OS X and 3) Linux. Each OS will be installed on their own harddisk. If the motherboard and display card are fully ...
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1answer
56 views

What is CSM option

What is the CSM option in BIOS? If I can't boot into Windows any more, is it because CSM is disabled? Would an ASUS K55 come with this option diabled?
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1answer
159 views

Install Windows 7 after Ubuntu: Cannot install because of GPT partition

I'm trying to install Windows 7 on a NTFS partition after installing Ubuntu 14.04. But it says that I'm using a GPT partition. The solution I found was to erase everything, then install Windows 7 then ...
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0answers
261 views

USB HDD disk not recognized in BIOS Boot order

I installed Ubuntu 14.10 along with Windows 8.1. Obviously I used a USB drive to install Ubuntu. I made all changes to UEFI so I could boot from USB. I could see the USB in the Boot Menu and was able ...
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0answers
113 views

Modify UEFI Windows Boot Loader

I have installed 2 systems on my ultrabook Asus UX32VD. I use Windows 8.1 x64 - on first SSD disk and Kali Linux (security distribution based on Debian) - on second SSD disk. I have fully encrypted ...
3
votes
1answer
38 views

UEFI strange behavior

Hi have a toshiba Satellite L50-A1-D6, with the latest (14/11/2014) bios update. I have removed windows8, completely formatted the HD ( in GPT ) and installed Linux (Ubuntu but this is not really ...
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0answers
215 views

Boot from CD using UEFI instead of BIOS

I have a Lenovo IdeaPad Y510P. This is my last attempt at recovering my computer, as my recovery partitions are gone and I cannot boot into my computer otherwise. I have Windows 8 x64 OEM installed. I ...
3
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3answers
576 views

Possible to install 64-bit Windows on 32-bit UEFI?

I recently purchased an HP Stream 7, which I was led to believe would have Windows 8.1 64-bit installed. However, it has 32-bit Windows, even though it has a 64-bit processor. Installing 64-bit has ...
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1answer
113 views

Why is the CPU frequency always very high on my system?

I have a Windows 7 Pro x64 system used as a home server. Hardware: Core i5, 4670K (3.4 GHz) on an ASRock Z87E-ITX with the latest UEFI firmware. I've discovered today that the CPU frequency is too ...
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0answers
139 views

Fedora 21 64bit DVD only recognized as BIOS not UEFI

How do I get my motherboard to recognize the UEFI option of the Fedora 21 install DVD? Per the docs, I need to boot to the UEFI option to install Fedora as UEFI. There is no separate media for UEFI ...
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0answers
24 views

'Use a device' missing a USB option

I have a preinstall of Win 8.1 Dell XPS 15 MY2014 I am working on going to a dual boot with Ubuntu as my second. I am trying to boot from the uSB while in EFI mode. I have hit the shift button ...
0
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1answer
424 views

Bypass UEFI on native Windows 8 Acer Aspire V5

I'm working on an ACER Aspire V5-121 OEM Windows 8. The original hard drive with the OS was removed, and I have a blank one... but could not install any other OS on it, not even Win 8. As the V5-121 ...
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1answer
59 views

ASUS K75V UEFI Windows 8

I want install Windows 8 on my ASUS K75V with UEFI Boot, but I don't know why, but it is still installing with Legacy boot. How can I change this ? Thanks, very much. ehm... will be UEFI boot on ...
0
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1answer
73 views

After configuring UEFI to boot from CD I can no longer boot back in Windows 8.1

I have tried changing the settings back but I still cannot access Windows 8.1 It automatically opens a repair window (with a large unhappy face) which disappears after half a second. The system then ...
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0answers
24 views

How do I add a Boot Services Driver (BSD) to UEFI?

I have a UEFI system with a third-party PCIe SAS adapter. I also have the UEFI Boot Services Driver (BSD) for the third-party PCIe SAS adapter (EBC, platform agnostic). How do I add the Boot ...
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2answers
348 views

GParted leaves 1MB unallocated space at end of external HDD, override/alternative?

I only say external HD, I don’t have this issue with internal HDs. I created a GPT table, then made one NTFS volume. It shows 1MB unallocated at end of disk. I know it is a backup of the GPT table, ...
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0answers
32 views

Is BIOS/UEFI used after OS startup?

I know that BIOS/UEFI is used during computer startup to boot the system and check HW and that it provides abstraction over hardware Does this mean, that the OS kernel calls BIOS/UEFI layer when the ...
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0answers
51 views

What is the difference between boot manager and boot loader in windows ? Can you have multiple hard drives with different boot manager?

What is the difference between boot manager and boot loader in windows ? Can you have multiple hard drives in a computer with each drive with a different boot manager ? I recently put multiple hard ...
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0answers
93 views

Does each hard drive need EFI\ESP, MSR system partition if you want to install operating system(s) on each drive?

Suppose, there are at least 5 hard drives: drive1, drive2, drive3, drive4, drive5, .... We want to use first 3 drives to install 5 operating system: windows 8.1, windows 7, windows vista, windows xp, ...
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0answers
32 views

Reinstall Windows 8 efi boot partition

While installing Linux for a dual boot system, I messed up and mistakenly formatted the efi boot partition as plain FAT so that everything on it now is lost. How do I recover from this? I already ...
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0answers
812 views

“bootloop of death” in a samsung Phoenix securecore tiano (USB and Uefi and Bootscreen and Setup screen are off!)

Technically it is "almost" a bootloop, since I can boot ubuntu on the hard drive, and I could boot from the DVD (breaking ubuntu grub on the hard drive or trying to chainload to the dvd). Still, it ...