After new Win 7 install - msg: Operating System Not Found

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  1. Posts : 16
    Windows 7 Home Premium x64
       #1

    After new Win 7 install - msg: Operating System Not Found


    Hi first time on the forum so if I don't give all the necessary info. let me know and I'll provide what I can.
    System : eMachines G640
    Disk Drive : WD3200BEVT
    O/S : Win 7 Home Premium x64 (from heidoc.net)

    Original disk drive failed with read errors so was replaced with above (like for like).

    Installing from USB stick - no problems during the install.

    After first reboot, system displays Operating System Not found unless the USB stick is present,
    and the let it go through press any key to install from USB WITHOUT pressing any key.

    Performed multiple installs, BIOS boot list is correct Hard Drive is top of boot list, BIOS set to AHCI Mode.

    I have read multiple forums and tried the following to no avail:
    Re-formatted drive from another computer (USB to SATA Cable) via windows 7 O/S
    diskpart clear all
    diskpart to set up partitions
    Formatted during the install process
    Manual bootrec /rebuildbcd, bootrec /fixmbr, bootrec /fixboot
    Fix via Visual BCD Editor
    Fix via install USB advanced repair options

    Been at this for a few days now and probably can't see the wood for the trees.
    Not a total novice more of a Unix man but this is really doing my head in....

    Screenshots of diskpart detail disk and disk management below:

    After new Win 7 install - msg: Operating System Not Found-diskpart.png

    After new Win 7 install - msg: Operating System Not Found-diskmgmt.png
      My Computer


  2. Posts : 687
    Microsoft Windows 10 Professional / Windows 7 Professional
       #2

    The reserved partition should be marked active and should not have a letter assigned, thats why its not booting correctly.
      My Computer


  3. Posts : 16
    Windows 7 Home Premium x64
    Thread Starter
       #3

    Thanks for the quick response OldMX. Did what you said then did:
    bootrec /rebuildbcd
    bootrec /fixmbr
    bootrec /fixboot

    This is what I have now:
    After new Win 7 install - msg: Operating System Not Found-diskpart.png

    After new Win 7 install - msg: Operating System Not Found-diskmgmg.png
      My Computer


  4. Posts : 16
    Windows 7 Home Premium x64
    Thread Starter
       #4

    Sorry, forgot to add I still have the same problem. Operating system not found.
      My Computer


  5. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       #5

    Hmm, this is indeed strange. I wonder how the C partition ended up as active in the first place.

    You did the right thing activating the system reserved partition Whether it has a drive letter or not is irrelevant. But the 3 commands you used (although often recommended) may not work to recreate the bootmgr. It is better to run startup/repair 3 times.
      My Computer

  6.    #6

    Set the Win7 HDD first to boot in BIOS setup, trigger flash stick installer to boot using one-time BIOS Boot Menu key.

    Run Startup Repair - Run up to 3 Separate Times regardless of what it reports until Win7 starts on its own.

    It would be better to use the Win7 DVD or System Repair Disk.
      My Computer


  7. Posts : 16
    Windows 7 Home Premium x64
    Thread Starter
       #7

    OK Chaps. I performed a clean all via diskpart then a new install.
    Performed the 3x startup repair.

    Still got the same problem.

    System is per the second lot of screen shots.
    i.e. System reserved partition is active without a volume identifier.
    Both are healthy.
      My Computer


  8. whs
    Posts : 26,210
    Vista, Windows7, Mint Mate, Zorin, Windows 8
       #8

    Download and burn to CD

    http://www.partitionwizard.com/download.html

    It is the last box on the webpage.

    Then do a Repair MBR with that CD.
      My Computer


  9. Posts : 16
    Windows 7 Home Premium x64
    Thread Starter
       #9

    OK, used partition wizard and still have the same problem.
    From system rec options I used the command line to run >bootrec /scanos
    No O/S is detected however I can still boot to the disk O/S with the install USB plugged in.
    Does this mean the MBR is not being written properly? If this is the case I don't understand as I
    have tried manually to do it, rebuild it with two different partition tools and with the rec options
    on the install USB.
      My Computer

  10.    #10

    The complication is most likely using the USB installer. Did you set it as I suggested earlier? Please confirm.

    If so do you have a DVD option for install?

    Try unplugging the flash stick at first reboot during install.

    Clean the HDD and define an Active partition as shown in Step 2.2 of SSD - HDD Optimize for Windows Reinstallation
      My Computer


 
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