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  RadarSync
Ensures you have the latest drivers and software updates to make your PC run better and safer.
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Partition Commander
Now it's easy for anyone to safely partition their hard drive! You can reclaim waste disk space, organize files, even add new OSes.
 
  Fix-It Utilities
Make your PC run like new! Includes Anti-Virus, Anti-Spyware, hardware diagnostics, registry fixer, and more!
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Fatal Startup Solutions
     
 

No active OS partition!

 
  Description  
     
 

The MBR (Master Boot Record) could not find a bootable partition. This issue occurs prior to the start of any Windows code.

It can be caused by a power-failure while the disk is in the middle of writing, a virus damaged the entry, a failing disk drive or a serious software bug damaged the partition entry (although Windows typically protects against this). This issue cannot be easily caused by any action you performed, unless you turned off the power without going through Windows shutdown.

 
   
  Sample Screen  
     
 

No active OS partition!
Press any key to reboot





 
   
  Key Facts  
     
 
Full Title
  No active OS partition! 
Press any key to reboot


Type
  Fatal MBR 

occurance meter
Windows
  All

Vendor
  Unknown
 
   
  Solutions and Fixes  
     
 
  Date Votes ratings
Check Hard Disk and Cables
6
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If you had changed, added or removed hard drives, or changed or removed drive cabling, likely something is wrong. Recheck that the drives are properly installed and the cabling has not changed. Switching cables to different motherboard connectors or changing the master/slave drive jumpers (on old ATA drives) can cause this problem. In some systems, the cables were not plugged into the drive or motherboard securely and may have worked loose. Reseat all drive connectors.

It's also possible a hard drive is failing. Use a system diagnostic to validate the drive or swap to another hard disk.

Several software products that offer disk diagnostics includes Fix-It Utilities Professional and SystemSuite Professional. Other diagnostic products include Eurosoft's PC Check and Iolo's System Mechanic.

If the first bootable drive is missing (disconnected or dead) the BIOS may be attempting to boot from a second disk. Confirm the primary drive is working.

 
   
 
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  FaultWire Staff
Posted: 5-Oct-2008
 
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Replace MBR and Fix Partition Table
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It's possible the code is damaged in the MBR (Master Boot Record) or the partition table is damaged. While the code can be easily fixed, a damaged partition table may not be repairable.

If you have a graphical partitioning boot CD we suggest using it. These tools can validate the partitions, it's fast and it can fix a some issues not possible with the Windows solutions. Using these tools, you'll replace the MBR with a Generic MBR and make the drive active/bootable. Instructions will vary by product. Remove the boot media, exit and reboot.

You can also replace the MBR from a command prompt if you are using Windows 7 or older. You'll need to boot from the Windows CD/DVD and go into the 7/Vista Recovery Console or XP Recovery Console and select Command prompt. Follow our instructions under recovery console to repair the MBR (instructions differ between Windows 7/Vista and XP).  Windows 8 no longer includes bootable tools, so a third party product is required.

Replacing the MBR does NOT change the partition table, so if it's damaged, it will not be fixed.

Once working, be sure to do an extensive scan for viruses and malware.

 
   
 
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  FaultWire Staff
Posted: 6-Oct-2008
 
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Last Resort Solutions
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If you skipped any of the prior solutions, you may want to return and try them out. These next options are when all else fails!

  • Remove the system hard drive and replace it with a blank drive. Install a fresh copy of Windows. If this works, it's unlikely to be a hardware issue. At worse, it may be time to start over with a fresh copy of Windows, although reinstalling your applications may make the problem reoccur.
  • Send the PC in for repair - someone else can deal with it!
  • Time for a new PC?
  • Consider a MAC, but wait - they can have similar hard-to-solve issues and you'd have to buy all new applications.
  • Use your PC as a boat anchor and go for a drink.
 
   
 
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  FaultWire Staff
Posted: 5-Oct-2008
 
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