Web resources:

http://www.howtogeek.com/howto/7728/troubleshot-startup-problems-with-startup-repair-tool-in-windows-7-vista/

Some Methods:

Start Windows using Last Known Good Configuration. If you’ve just made a change to your computer that you suspect might have caused Windows to stop booting properly, starting with the Last Known Good Configuration could help.

Start Windows in Safe Mode and then use System Restore to undo recent changes. Windows could freeze, stop, or reboot during the startup process because of damage to a driver, important file, or part of the registry. A System Restore will return all of those things to their last working order which could solve your problem entirely. You can also start a command prompt from the System Repair dialog box.

For Windows 7: Boot from the repair disk > Choose keyboard and click Next > Use recovery tools… and click Next > Windows may find problems fix them and reboot, if it works great. If it didn’t work or it didn’t find problems continue on > choose Command Prompt

For Windows 8, Windows 10, Windows 2012 R2: Boot from repair disc > Choose Keyboard type > click Troubleshoot > click Advanced options > choose Automatic Repair

if that fails then use:

-Boot from Recovery disc or Install disc

-Boot from repair disc > Chose Keyboard type > click Troubleshoot > click Advanced options > choose Command Prompt

or

-Boot from Install disc > Click Next > click Repair your computer > click Troubleshoot > click Advanced options > choose Command Prompt

Tools to fix boot problems:

Msconfig (from Windows)

Bcdedit: http://technet.microsoft.com/fr-fr/library/cc709667(v=ws.10).aspx

bootrec: http://support.microsoft.com/kb/927392/en-us

  • bootrec /fixboot (writes new boot sector to system partition)
    bootrec /scanos (scans for other OS’s that you might want to add to bcd)
    bootrec /rebuildbcd (scans for other OS’s, unlike rebuildbcd it allows you to select the OS’s you want to add to bcd)

Also: Emergency repair disk (ERD) from the MDOP (but requires the software assurance – more for larger companies)

bootSect: http://technet.microsoft.com/en-us/library/cc749177%28v=ws.10%29.aspx

  • bootsec /fixmbr (writes mbr but does not overwrite partition table)

bcdboot (The BCDboot tool is a command-line tool that enables you to manage system partition files): http://technet.microsoft.com/en-us/library/dd744347%28v=ws.10%29.aspx

Third-party tools:

iolo system mechanic (www.iolo.com) , system rescue CD (http://www.sysresccd.org/Page_Principale), gparted (http://gparted.sourceforge.net/), EasyBCD (http://neosmart.net/EasyBCD/), VisualBCD editor

Tools to fix boot problems:

to find on google: repairing windows 2012 R2 startup, repair windows startup, repair windows boot
Method 1:
===============
1. Put the Windows Server 2012 R2 installation disc into the disc drive, and then start the computer.
2. Press a key when the message indicating “Press any key to boot from CD or DVD …”. appears.
3. Select a language, a time, a currency, and a keyboard or another input method, and then click Next.
4. Click Repair your computer.
5. Click the operating system that you want to repair, and then click Next.
6. In the System Recovery Options dialog box, click Command Prompt.
7. Type sfc /scannow, and then press ENTER.

Method 2:
===============
1. Put the Windows Server 2012 R2 installation disc in the disc drive, and then start the computer.
2. Press any key when the message indicating “Press any key to boot from CD or DVD …”. appears.
3. Select a language, time, currency, and a keyboard or another input method. Then click Next.
4. Click Repair your computer.
5. Click the operating system that you want to repair, and then click Next.
6. In the System Recovery Options dialog box, click Command Prompt.
7. Type Bootrec /RebuildBcd, and then press ENTER.

Method 3:
===============
1. Put the Windows Server 2012 R2 installation disc into the disc drive, and then start the computer.
2. Press a key when the message indicating “Press any key to boot from CD or DVD …”. appears.
3. Select a language, a time, a currency, and a keyboard or another input method, and then click Next.
4. Click Repair your computer.
5. Click the operating system that you want to repair, and then click Next.
6. In the System Recovery Options dialog box, click Command Prompt.
7. Type BOOTREC /FIXMBR, and then press ENTER.
8. Type BOOTREC /FIXBOOT, and then press ENTER.
9. Type Drive:\boot\Bootsect.exe /NT60 All, and then press ENTER.

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