Boot (or booting) refers to the action of starting up a computer and getting it to run the operating system.

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Why isn't rEFInd shell loading?

Because of a two-steps deep problem, I need to boot into an EFI shell and run gptsync. I downloaded the flashdrive binaries of rEFInd 0.7.4, used dd to write the image to a thumbdrive, and it seems ...
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58 views

What happens in a ARM based system before the OS is loaded?

What happens in a ARM based system before the OS is loaded and do they have BIOS, drivers, MBR or a different approach instead of these?
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2k views

How to install dism through command line in windows 7 by booting from a recovery windows 7 iso in a USB?

Recently I installed a faulty security update (2823324) released by Microsoft http://support.microsoft.com/kb/2839011 . My computer is constantly getting blue screen and restarting. I have tried each ...
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85 views

PC won't boot from flash drive after computer hibernated (grub on hdd corrupt too)

I had 3 OS installed: Windows 7 , Fedora 17 and Mageia 2 in my Acer Aspire 4253 laptop. I deleted the partition of Mageia and my grub got corrupted. I didn't have an installation DVD of either Win7 ...
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437 views

c000021a BSOD on Windows 7 boot

I guess I can't since I'm getting the error message: The version of System Recovery Options is not compatible with this version of Windows you're trying to repair. Try using a recovery disc that ...
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352 views

Making grub boot into chroot directory

I am trying to make grub boot into a chroot directory /slack containing a Slackware Linux installation. This directory was created by issuing the following command: installpkg --root /slack a/*.t?z ...
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50 views

Stuck on GRUB command prompt after regular kernel update

I am running Debian Wheezy. Update Manager suggest to install kernel update. After update, I reboot system but instead of listing all the kernels (bootloader), it gave me a GRUB command prompt: ...
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411 views

Surface Pro won't boot from usb

I have had a surface pro for a while now and I have decided to try and boot from USB on it. It won't boot from it. I have tried an external hardrive with Windows Vista on, a Windows 98 Microsoft-dos ...
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77 views

Why would my notebook only turn on after several attempts?

It was working perfectly fine until I changed it's Celeron processor for a Core 2 Duo today. Now it only turns on 1 out of 5 or 6 attempts. Sometimes at the 1st or 2nd attempt. It's pretty random by ...
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133 views

Avoid Windows 8 BCD File becoming missing and/or corrupt

I realise there are plenty of questions about BCD errors here however I feel mine is slightly different. I had a missing BCD file so I couldn't boot. I have now solved this using a question I found ...
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101 views

Stuck at GRUB prompt after booting, how can I restore normal booting?

My machine was dual-booting with Windows XP and Fedora, then I tried to install Arch. While installation power went off. After that, booting always results in the GRUB prompt. Even when I instruct my ...
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92 views

Why won't my SSD boot when it's cold?

I know that some SSDs rarely have an issue with "cold boots" under certain firmware and software configurations. However in this case I have had two SSDs (different brands) that would literally not ...
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189 views

PC won't start unless I reset CMOS

Situation: My PC is dead in the water. Both power buttons (Case/MB) have no effect. If I pull the power cable, reset CMOS, reconnect the power cable, then press either power button the PC fires right ...
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133 views

PC reboots after “Welcome to Grub” unless booted from BIOS

I have a Linux machine running on an ASUS P8H77-I. The boot drive is correctly set in the BIOS. If I let it boot normally, I see the Welcome to Grub line, then it reboots, and repeats forever. If I ...
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358 views

Dual Boot and Virtualize the Same Partition- Kali Linux in Windows 8

I am trying to virtualize an existing partition, as detailed in this article, as described here in the VirtualBox manual. The Kali install is on a logical partition on the same disk as my Windows ...
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167 views

WinPE 5 - How can I change the USB/CDROM drive letter?

If i boot up my custom WinPE 5 x64 image from an USB stick the following drive letters are assigned: C: ==> USB Stick X: ==> RAM Disk This seems to be a problem for our SCCM 2012 staging process ...
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964 views

Issue using a “used” SSD as a Windows 8.1 Boot Drive

So, I'm something of a Mac person, but decided to take a stab at this whole "build yourself a PC" thing - right now, the thing is assembled, posts just fine, and can get to the BIOS. The problem is ...
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52 views

Computer won't power on

Was working fine for over a year, now won't boot. LEDs on the GFX card and one on the MOBO labeled PWR glow when plugged in, but nothing happens when I push power and shorting switch pins does nothing ...
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226 views

Corrupted Windows 8 MBR, recovery disk's repair tools fail

I'm using Windows 8 64 bit on an ASUS N56 Laptop. I was attempting to upgrade to Windows 8.1 and the installation was interrupted. Attempted System Restore, which didn't work. Long story short, I ...
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117 views

Why rebooting the system takes longer than a shutdown in fedora?

I'm a fedora (19/ x86-64) user. When I power off the system, it always takes about 3 to 4 seconds to shut down. But whenever I reboot the system, it takes the system much longer (about 30 seconds or ...
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363 views

Computer wont finish booting after I install a third graphics card

I'm running xubuntu on this motherboard and three sapphire 7950 graphics cards. The computer boots and works fine when I have just two of them installed, but when I attach the third the computer stops ...
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214 views

Uefi and full disk encryption with lvm on luks

I have an asus machine on which i can use old bios and new uefi. I've always used the old bios system, running a full encrypted debian with the following configuration: an unencrypted boot partition ...
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207 views

How is /sbin/init found during lilo boot

I just cloned my root partition (in anticipation of a dist-upgrade), changed lilo.conf and fstab (in the cloned partition) and ran lilo. But alas the system won't boot from the cloned partition. I ...
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142 views

How to automatically run an app as administrator and make its UI visible to non-admin users under Windows 8

I have found many examples of how to get apps to automatically start and run (without UAC prompting), but have not managed to find one that allows the app's UI to be visible to a non-admin account. ...
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213 views

Making sysvinit load EVERYTHING in parallel - why does this even work?

I edited /etc/init.d/rc on my Debian machine and changed startup boot to startup boot &. Boot time decreases ridiculously, and no race conditions happen at all. Way faster than even Systemd (which ...
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2k views

BSOD - “replacing invalid security ID with default security ID” - Cannot boot to windows, black screen

I was working away on my computer when it suddenly blue screened. It's maybe done that once many months ago. Upon Reboot it began running checkdisk, moving orphaned files and then it got to this ...
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1k views

What is the use of the [BOOT]/Bootable_NoEmulation.img file on several boot images?

I've seen a file called [BOOT]/Bootable_NoEmulation.img on several boot images, and always wondered what it's use is. Neither found a suitable magic number nor could Google help me so I ask here. ...
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449 views

CentOS Freezes on Startup

I'm very new to Linux, so please go easy! I created a Linux install on VMWare Workstation 8 in order to install a piece of software called OpenClinica. The program is Java based and depends on ...
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579 views

Windows 7 fails to start after shut down

I have Windows 7 Home Premium 64-bit on a 2-year old Lenovo SL510 laptop. This is the current issue: Windows fails to start after the computer shuts down. It gets to the Windows logo load screen and ...
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117 views

How to recover corrupted Windows XP installation?

I have a Netbook without a CD rom which has been running Windows XP. I decided to install Linux on it to run a dual setup, however that somehow corrupted my Windows installation, probably because of ...
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719 views

Keyboard not working in boot menu

I am using an Asus P8Z68-M Pro motherboard and a PS/2 Keyboard. My keyboard does not work in boot menus like when I'm selecting an OS and when selecting which kind of Windows safe mode to use. The ...
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1k views

After Windows Update - Cannot Boot in Windows 8 Pro

I have a fresh install of Windows 8 Pro on a new PC and have done for some weeks. On Friday I hit the shutdown option Update and Restart. On the Saturday (yesterday) I turned on my machine to greeted ...
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60 views

What is the `/etc/hostname` used/required for?

I found in the /etc/hostname my IP-address, than I deleted it and each time I use sudo - I get a message and a system email sudo: unable to resolve host (none) or if in the /etc/hostname is saved ...
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140 views

Windows 7 on bootable flash

I have two quick questions, I used the Windows USB tool to put ISO on my flash drive, but it made me delete everything first. Do you know why this is? Also, once I have Windows on there, is it okay ...
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23 views

trouble with startup after power failure

The last few times the power went out I have had trouble restarting. The monitor shows entering power save mode. I then hold the start button in to cold boot. After the flashing amber light goes on ...
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62 views

Computer stopped booting after I tried to allocate a drive to unallocated space

I installed Ubuntu on my Windows 7 yesterday and after that I booted to Windows. After that as I saw an unallocated space while installing Ubuntu, I tried to allocate that unallocated space to make it ...
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466 views

How to remove “Intel Anti Theft device cannot be detected” error message on boot?

Whenever I boot up the laptop the following error message pop-ups: There is a problem with Intel Anti Theft Device can not be detected* (*not word for word) I believe that Intel Anti-Theft was ...
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337 views

Windows 7 EFI Partition Deleted

I converted my Windows 7 GPT disk to dynamic, which resulted in it being unable to boot. So I used EaseUs Partition Master on my second Win 7 installation to convert the disk back to basic. Now, I ...
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406 views

Windows Recovery partition unusable after Ubuntu 12.04 install on Eee PC 1005P

Installed Ubuntu 12.04 over the secondary (D:) partition with Grub2 handling multi-boot. Never accessed the 'Recovery' option in the boot menu until Windows7 Starter became unusable due to HDD failure ...
2
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153 views

Lenovo ideaPad s10-2 - Boot.ini numproc

I'm using a Lenovo ideaPad s10-2 with Windows XP Home. What is the default value of numproc under Boot.ini? (run >msconfig >boot.ini) Thanks.
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212 views

Some USB drives not showing in BIOS

I have a GA-MA790FXT-UD5P motherboard. I have an old USB drive that it will boot from just fine. I have two (identical) newer ones, but they will not boot. I found out that the newer ones aren't even ...
2
votes
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151 views

What does the linux kernel/initrd loading time depend on?

I recently updated my Linux kernel from 3.1.10 to 3.5.0. Upon booting with GRUB, I noticed that this kernel (or the initial ramdisk?) takes a much longer time to load (~5-6 s vs. ~1 s with the old ...
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1k views

Windows 7 will not boot after sleep

As the title says. My PC with windows 7 will not boot up correctly after going into sleep mode and failing to wake up. From what I can tell this is a common problem with the motherboard ASUS P6T ...
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0answers
137 views

Hardware doesn't work some times at boot time

I have an Asus n51vf laptop. I bought it not long time ago (less than a month) and installed Windows 7 on it. Since that it wasn't new when I bought it, I don't know, if the problem was occuring ...
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2k views

Why boot fails with bios SATA Mode as AHCI?

In a nutshell, I am trying to figure out for some Jetway engineers and myself, why the custom bios they made me does not allow SATA devices to boot in AHCI mode. Obviously, this is difficult to ask ...
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217 views

Need technical info on NEC FC-9801V “factory” computer

A friend has an obsolete Japanese CNC metal-working machine which is built around an NEC FC-9801V "factory computer". The FC-9801V is a V30-based machine similar to the very popular (in Japan) ...
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132 views

Clearing the CMOS fixed my computer but I want to know why it was necessary

After a shutdown my PC would turn on, but would not boot (nothing appeared on the monitor). I cleared the CMOS on my motherboard via the jumper, and then was able to enter the BIOS setup menu and ...
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329 views

How to allow root user to start up under FileVault 2 in Lion?

I just enabled Whole-Disk Encryption (under the name FileVault 2) in Mac OS X Lion. In the setup process, I was asked to select the users whose passwords can unlock the startup disk. I have the root ...
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697 views

Windows Server 2008 R2 only boots to Recovery Console

I was bringing up a server this morning, and all it will do is boot to the recovery agent, giving the following options: Restore a backup image, Memory Check, Command Prompt, shutdown, restart. The ...
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2k views

dmesg.log on Mac OS X

Mac OS X does not seem to dump the exact output of dmesg to a file. I need to log the dump of dmesg to the disk. kernel.log and system.log do not contain the required information. Only output of ...