Can no longer boot from DVD or USB HD since installing Win10

5/2/15
I download and installed the latest Win10 last week and popped it on a spare HD I have in the system;
the mistake I made was to leave my SSD which has Win7 on it connected during the install.
Now I’m in a bit of a pickle. When I boot up with the Win10 disk disconnected I get a splash screen that tells me:
A required device isn’t connected or can’t be accessed. It offers me an option to press F9 to boot to another OS and indeed it does boot me into Win7 but insists all my hard drives need a chkdsk. They are fine
So I thought I’d simply boot from a DVD or USN drive and “fix” the Win 7 install.
Lol , it won’t boot from a DVD or the USB HD. If I pull the Sata cable from the SSD containing Win7 it boots right up from either the DVD or the USB HD.
I’d really not like to do a clean install of Win7 on my SSD just to get around this.
When the drive I loaded Win10 is connected it still won’t boot from a DVD but does allow me to boot into 7 or 10.
Yeah, yeah I know I should have installed it in a VM but I didn’t. Any suggestions?
Mobo ASUSTeK Computer INC. P8P67 Rev 1.xx
12G Ram
CoreI5-25K
Win7 Ultimate on the SSD
Last weeks build of Win10 on a spare HD in the system

press Windows+R then in the box, msconfig
this will allow you to modify the boot settings as desired
this tool works as well to clean up programs that want to load with windows unnecessarily
Place your rig specifics into your signature like I have, makes it 100x easier!
Hardcore Games Legendary is the Only Way to Play!
Vegan Advocate How can you be an environmentalist and still eat meat?

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Jeroen63, welcome to the forum.
I suggest that you visit www.ubuntuforums.org for help with your problem. They are the experts on Ubuntu and will be able to help you. I have used Ubuntu for years, but still go to their forum when I have a problem.
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HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
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How can i install snow leopard on my mac G5 using a command line and booting from an external usb rom, since my disk i have is not a bootable media

How can i install snow leopard on my mac G5 using a command line and booting from an external usb rom, since my disk i have is not a bootable media

Hi.
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I can not boot from DVD or USB to install

I have a 27 in iMac with i7 processor. For reasons I wont get into (lets just assume I have the right reason) I want to do a complete fresh install of Snow Leopard and start completely over.
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I don't know how much help I'll be to you. Seems to have a lot of posts lately about not being able to start up from the install disks.
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When you hold the option key to start, does the screen come up with the option to choose a startup disk and is your Install Disk in when you attempt this?
While booted up normally, does the Install Disk open up with the install OSX menu? If so, does going through the install menu reboot the computer from the CD automatically?
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IMac 24" Aluminium - No way to boot from DVD

Dear all:
Thank you for having this forum fully working.
My iMac 24" Aluminium (november 2008) can't boot, completely frozen, although all HW are perfectly working.
I'll try to explain the issue best I can.
SYMPTOMS
- Grey screen of death without Apple's logo.
- No bootable devices detected (either HDD or DVD) by EFI, when you hold ALT (Option) while booting.
- No way to force boot from DVD.
CAUSE OF PROBLEMS
a) HDD has 3 partitions created by DiskUtils:
/dev/disk0s2= Mac OS(HFS+)
/dev/disk0s3= Linux DVD Installer (FAT32)
/dev/disk0s4= User Data(HFS+).
b) rEFIt installed and fully working on the system ( http://refit.sourceforge.net/ )
c) Linux DVD installer partition was filled this way:
dd if=/path/to/linux.iso of=/dev/disk0s3
As you can see, there are no HW errors at all, everything was perfectly working before dumping the Linux iso into FAT partition.
TRIALS FOLLOWED (and all its combinations).
TRIAL 1 - Erasing EFI values on memory.
Leave the iMac disconnected from power cord a whole night for memories to loose their values.
http://www.youtube.com/watch?v=JId524890zc.
TRIAL 2 - Force empty memories during boot.
CMD+ALT+P+R -> Result OK (reboot)
CMD+ALT+N+V -> No effect
CMD+ALT+O+F -> No effect
http://support.apple.com/kb/ht1533
TRIAL 3 - Force boot from DVD.
C while boot -> Read DVD first, but can't boot.
http://support.apple.com/kb/ht1533
TRIAL 4 - From Startup Manager, try to boot from DVD.
ALT (Option) while boot -> See cursor arrow on screen, can't see DVD as boot option.
a) Try with DVD already inside the unit.
b) Try to insert DVD once I see the cursor arrow on screen.
https://discussions.apple.com/thread/1383424?start=0&tstart=0
TRIAL 5 - Remove RAM memories to reset EFI to factory defaults.
- Remove all RAM from unit.
- Boot from DVD (C key hold) -> Unit beeps.
- Shutdown and fill one bank with memory.
- Wait 15 minutes for EFI memories values to be deleted.
- Boot from DVD (C key hold) -> Access DVD first, but no boot.
TRIAL 6 - Boot from external Mac (Firewire + PC fully working).
This is the only trial missing before replacing the HDD of the unit... finger crossed.
http://forums.macrumors.com/showthread.php?t=271975
IDEAS AND CONCLUSIONS
- Any more ideas?
- How is it possible that a SW problem affects the HW in a way that can't be booted from DVD? Somethings is terribly wrong on iMac EFI design... terribly poor stability.

Dear all:
Thank you for having this forum fully working.
My iMac 24" Aluminium (november 2008) can't boot, completely frozen, although all HW are perfectly working.
I'll try to explain the issue best I can.
SYMPTOMS
- After a chime... grey screen of death without Apple's logo.
- No bootable devices detected (either HDD or DVD), when you hold ALT (Option) while booting.
- No way to force boot from DVD.
CAUSE OF PROBLEMS
a) HDD has 3 partitions created by DiskUtils:
/dev/disk0s2= Mac OS(HFS+)
/dev/disk0s3= Linux DVD Installer (FAT32)
/dev/disk0s4= User Data(HFS+).
b) rEFIt installed and fully working on the system ( http://refit.sourceforge.net/ )
c) Linux DVD installer partition was filled this way:
dd if=/path/to/linux.iso of=/dev/disk0s3
As you can see, there are no HW errors at all, everything was perfectly working before dumping the Linux iso into FAT partition.
TEST BED
In the process of dealing with iMac booting problems I organized a test bed which allow to detect where the booting is failing:
STAGE 0 - Setting initial boot memory conditions.
STAGE 1 - Reset NVRAM memory to factory defaults.
STAGE 2 - Booting from external device.
STAGE 3 - Reinstall iMac firmware.
STAGE 4 - Hardware intervention.
Before running the test bed:
a) Unplug all devices except USB keyboard (no wireless keyboard, no mouse... you can plug an USB mouse once you see the graphical user interface up and running).
b) Combination of keys available on booting:
http://support.apple.com/kb/ht1533
STAGE 0 - Setting initial boot memory conditions
This bundle of tests must be executed before any test of next stages.
TEST 0.1 - Erasing booting memory values.
Leave the iMac disconnected from all wires (especially power cord) for 15 minutes for memories to loose their values.
http://www.youtube.com/watch?v=JId524890....
TEST 0.2- Resetting PRAM memory.
a) Press Power button
b) Press CMD+ALT+P+R keys while black screen, before you hear the chime.
c) Hold these keys until you hear 3 chimes (3 reboots).
http://support.apple.com/kb/ht1379.
STAGE 1 - Reset NVRAM memories to factory defaults.
TEST 1.1 - Validate machine with Apple's Hardware Test.
=> Detect Hardware errors with Apple's Hardware Test
a) Original Apple's Installation DVD on the machine
Installation DVD should show something like this
DISC 1
Mac OS version 10.5.4
AHT version 3A152
Disc version 1.1
2Z691-6304-A
To use Apple Hardware Test, hold down the D key as the computer starts up.
b) Holding Down D key as the computer starts up
http://support.apple.com/kb/HT1509.
=> Hardware OK: continue with Stages 1, 2 and 3
=> Hardware Failure: jump to Stage 4 (skip Stages 1, 2 and 3)
=> Unable to run Apple's Hardware Test: jump to Stage 3, firmware restoration
TEST 1.2 - Change RAM Configuration: amount or disposition.
a) Open RAM Slot
b) Extract RAM stick from Slot.
c) If you only have one RAM stick, reintroduce it in the unused empty slot of memory.
TEST 1.3 - Resetting PRAM memory.
Please check TEST 0.2
STAGE 2 - Booting from external device
TEST 2.1 - Boot from DVD.
a) Introduce Apple's Mac OS original DVD on the unit.
b) Run Test 0.1 and Test 0.2
=> Force DVD as Booting Device.
c) Press power button.
d) Press C key while black screen, before you hear the chime.
e) Keep hold the C key until you see the MacOS installer window.
http://support.apple.com/kb/ht1533
=> If still no boot from DVD: StartUp Manager with DVD inside the machine.
c) Keep hold Power Button 10 seconds to reboot the machine.
d) Press ALT key while black screen, before you hear the chime.
e) Keep hold the ALT key until you see the StartUp Manager.
f) From StartUp Manager, choose DVD as booting option.
https://discussions.apple.com/thread/138...
=> If still no boot from DVD: StartUp Manager without DVD inside the machine.
c) Keep hold Power Button 10 seconds to reboot the machine.
d) Press F12 key while black screen, before you hear the chime.
e) Keep hold the F12 key until DVD is spelled from the iMac.
f) Run StartUp Manager again (see steps above) .
g) Insert Apple's Mac OS DVD on machine while StarUp Manager is running.
h) From StartUp Manager, choose DVD as booting option.
https://discussions.apple.com/thread/138...
TEST 2.2 - Firewire cable and Target Mode: run installer from external Mac.
http://forums.macrumors.com/showthread.p...
TEST 2.3 - Remote Installation.
You can run this test twice: remote installation from PC and MAC.
=> Remote Installation Server on PC/MAC:
a) Mac OS DVD on PC/MAC optical drive
b) Install Network Client (just run setup.exe from DVD and follow the steps until everything is installed).
c) Keep open a window saying... machine is ready for Remote Install.
=> Physical Direct Network Connection between Remote Installation Server and iMac
a) Unplug power cord from iMac for 15 minutes.
b) Connect to the Server Machine this way:
Option 1.- Crossover Ethernet wire direct connection,
Option 2.- Using an Ethernet switch with no additional devices plugged to the switch.
=> StartUp Manager on Client
a) Run Test 0.1 and Test 0.2
b) Press power button.
c) Press ALT key while black screen, before you hear the chime.
d) Keep hold the ALT key until you see the StartUp Manager.
e) From StartUp Manager, choose NetInstall as booting option.
http://support.apple.com/kb/PH6450
TEST 2.4 - NetInstall.
=> Prepare NetInstall Mac OS NetBoot Server
Option 1 - Using Mac OS X Server
http://support.apple.com/kb/HT4178
Option 2 - Using Linux Server
https://docs.math.osu.edu/linux/how-tos/...
=> Force Boot from the Network
a) Run Test 0.1 and Test 0.2
b) Press Power Button.
c) Press N key while black screen, before you hear the chime.
d) Keep hold the N key until you see the Mac OS X Installation screen.
=> If no NetBoot after 15 minutes: NetBoot from StartUp Manager
a) Keep hold Power Button 10 seconds to reboot the machine.
b) Press ALT key while black screen, before you hear the chime.
c) Keep hold the ALT key until you see the StartUp Manager.
d) From StartUp Manager, choose NetInstall as booting option.
TEST 2.5 - Apple's Mac OS Installer/Reparation from External USB HardDrive.
Very unlikely to work.
=> Create Bootable OS X USB device
a) Format HDD with GUID partition.
http://support.apple.com/kb/PH7247
b) Fill the partition with the Mac OS X installer (only the version your iMac came with, no newer, no older).
=> Boot iMac from USB device
http://support.apple.com/kb/HT1948
STAGE 3 - Reinstall/Repair iMac Firmware
TEST 3.1 - Using Firmware Reinstallation CD.
a) Download and burn Firmware Restoration CD for your iMac
iMac 8,1: http://support.apple.com/kb/TA24012
b) From power off state, press the power button and continue to hold it down until the "Sleep" LED blinks rapidly three times, then slowly three times, then rapidly three more times... this could be chimes, instead of LED blinks! Keep the power button pressed down.
c) Insert the Firmware Restoration CD you have burned into the iMac's CD drive, then release the power button.
d) Monitor the "Progress Bar" beneath the Apple logo as the restoration process updates your iMac's firmware, taking care not to disconnect the power, shut down your computer or restart your computer (otherwise, you will have to start over). The iMac will restart automatically once the firmware restoration is complete.
TEST 3.2 - Using Apple's Propietary Software.
Contact Apple's Technical Support to know the price.
STAGE 4 - Hardware Intervention
TEST 4.1 - Replace the faulty Hardware on your own.
a) To detect faulty Hardware, please run Test 1.1
b) Replace the Hardware following those instructions:
http://www.youtube.com/watch?v=3w6E2_Xqa...
TEST 4.2 - Contact Apple's Technical Support.

How to reset password if you can't boot from DVD?

I just bought a second external disk drive and installed Leopard on it. When it asked me if I wanted to import my information from my internal drive, I said OK, not realizing that since I had a blank password on this drive (running 10.2.8), that would not work with Leopard. One of the reasons why I bought the second disk drive is that my internal superdrive failed, and I had added on an external Lacie superdrive which does not function as a boot drive, and I wanted to run the new OS on another drive so if one drive failed, the other would work as a boot drive. However I can't boot from the DVD to reset the password on my external drive to an actual password. I disconnected the external drive and am working on my internal drive with 10.2.8. (So something I planned for worked)
I suppose one solution would be to erase the new external drive and start the whole install process all over again, making sure to add a password on this drive first. But that took about five hours and I'd really rather not. Is there some way to reset the password remotely using the OS from my internal drive to look at the external drive? Or is the non-boot from an external USB superdrive a problem unique to 10.2.8 but if I set the external drive to be the boot drive, the Leopard DVD would boot the external drive?
Thanks.

Thanks. Thankfully, when I thought about it, I realized that the computer had booted from the external superdrive to install Leopard, so I figured I'd give it a shot by selecting the install disk as the startup disk and restarting, crossing my fingers and hoping. It worked, so I was able to simply reset the password using the reset password function. Perhaps the issue with the external superdrive is that if it's not already mounted with a system disk before you restart, it won't do it after it starts up in event of failure.
And if that hadn't worked, I would have booted from my internal drive, used disk utility to wipe out the external drive, put a password on the 10.2.8 account, and done the whole install process again and migrated the account now with a password to the drive.

Can Solaris 10 boot from USB devices like USB thumb?

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No installation requirement.
2. Can Solaris 10 boot from USB devices like USB thumb?

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Hard disk doesn't appear in disk utility when booting from dvd only via usb

i put a new hard disk (wd3200bevt) in my macbook white and my macbook pro 2.4 (not alu). when i boot from the dvd (10.5) disk utility doesnt find any disk. when i boot from an usb stick with leopard on it then it found the disk and i can install the system. when the system is installed and the books can boot the installed system anything looks fine, but when i boot from the original dvds disk utility doesn't find any hard disk once more.... when i boot from my usb stick it shows the new disk in disk utility. what is the problem when i boot from dvd?

don't know but try two boots in a row. worked for me.

Why can't I boot from the OS X DVD on my Intel iMac?

I'm trying to boot from the Mac OS X Tiger CPU Drop in DVD that came from the Apple Refurb Store with my Intel iMac.
I have tried holding down the C key on start up and it doesn't work. It boots like normal to the hard drive
I have tried using the Start up Manager, but all it can see to boot from is my installed OS X system on the hard drive and my Windows Boot Camp partition.
The CPU Drop in DVD is all that shipped with my machine. Can one even boot with it?
My problem is Photoshop Elements refuses to start up, giving me EXCBADACCESS and KERNINVALIDADDRESS alerts. It crashes every time about half way through starting up. Trashing it's preference folder doesn't fix the problem. In fact, my Preference folder keeps filling up with folders labeled with jibberish names.
I found a discussion thread that I should boot from the original disk that came with the machine and use Disk Utilities, but I can't even boot from the DVD drive.
What step am I missing?
TIA
Kathryn

Hi knittsings!
It's only possible to boot an Intel-based iMac from a grey-labeled DVD, so if you received a black-labeled DVD, someone made a mistake packaging your refurb. The correct DVDs should have been in the smaller box with the User Guide and other small, square documents, along with the mouse and remote. If you find the grey-labeled DVDs in there, just keep the drop-in DVD, they won't need it back since they make them:)
If you don't find them in there, call Apple, or log into your account on the Store page and find your order's link for customer follow-up/issues.
Message was edited by: myhighway

Can't boot from windows 7 usb installation media

When trying to boot from windows 7 usb installation media no efi boot option availiable. Using "boot from efi file" option whith each and every .efi file on installation media results in a message saying "The selected boot device failed. Press <Enter> to Continue".
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Installation boots from aforementioned media successfully when CSM enabled, though i would really prefer installing Windows 7 in uefi mode. Which microsoft claims Windows 7 supports.
Any help or suggestions would be much appreciated. Thanks in advance.
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Booting from USB 2.0 port or DVD with SecureBoot disabled gets me to a screen saying "starting windows", just before the actual setup begins and then system simply hangs. Still unable to install. Thanks for your suggestion though.

Can all macbooks boot from usb(stick,hdd) and firewire(hdd) an os: linux, win, mac os x, opensolaris, etc

Subject: BOOT FROM EXTERNAL STORAGE DEVICE - After this setup properly
Can all macbooks boot from usb(stick,hdd) and firewire(hdd) an os: linux, win, mac os x, opensolaris, etc?
what about:
Apple MacBook Pro MB133LL/A 15.4-inch Laptop(OLD VERSION) (4GB RAM 120G HD 2.33 GHz Core 2 Duo processor, 15.4" Matte Screen, 4GB memory, 120 GB 7200 rpm hard drive) White

Yes,
Disconnect everything hooked up to the PC except the keyboard, mouse and monitor.
Then use this method to flash the BIOS. It is the safest way to go.
USB Device BIOS Flashing in DOS
DOS Flash (DOSFlash.exe, FlshUefi.cpu) is the DOS-compatible System BIOS flash utility that can be used from a DOS bootable storage device (where "DOS" refers to any of a number of compatible operating systems such as FreeDOS, MS-DOS or DR-DOS). FlshUefi.cpu is the required driver for DOSFlash.exe. To flash the System BIOS from a bootable USB storage device, you will need to copy the contents of the DOS Flash folder to the USB device, boot the PC from the USB device, and execute the DOSFlash application. To see a more complete description of the DOS flash utilities, view DOSFlash.txt located in the DOS Flash folder. This folder also contains the required binary image of the BIOS. The binary image file is named xxx_MMmm.bin where "xxx" is the BIOS family, "MM" is the major version number, and "mm" is the minor version number. This file can be copied to the root directory of any USB removable medium for use with the F10 setup "Flash System ROM" option
View Contents of DOS Flash Folder
The links on this post don't work. I copied the section from the BIOS flashing instructions for the specific section you need.
Paul

Can no longer boot from DVD or USB HD since installing Win10

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