Operating system missing

Hi all,

I've had Windows 7 since the release date, but for some reason it has stopped working. I can start up my PC, but at the login screen it crashes (sometime bluescreen, sometimes not). I tried safe mode, debug mode, CD-boot, system repair, but it just crashes when I get past the part where Windows does some basic starting.

The problem started today, I went downstairs to get some breakfast, and when I came back my PC was restarting. Then I tried starting it again, but it crashed on the login screen (blue screen). At that point I was able to get into safe mode, but for some reason I'm not able to do that either anymore.

Then I tried "Optimized settings" in my BIOS, and now it sais "Operating system missing". I already tried booting from the CD. I went into command prompt in the "repair PC" screen, and tried:

But all with no luck. It did find my OS tho on the C partition, but for some reason it said "Element not found" on fixboot.

Does anyone have a clue what could fix my problem?

Windows 7 Ultimate
Intel Core i7 920
Gigabyte GA-EX58-UD5
Corsair Triple3X Dominator 6GB DDR3-1866 CL9 triple kit
Graphics Card(s)
Club 3D Radeon HD5870
Sound Card
Monitor(s) Displays
1. Dell 2408WFP. 2. Iiyama ProLite E431S. 3. Sony TV
Screen Resolution
1. 1920x1200. 2. 1280x1024. 3. ?x?
Hard Drives
2x WD Caviar Black 500GB (RAID 0)
1x OCZ Vertex 60GB SSD
Corsair HX750W
Cooler Master CM690
Logitech G15 v2
Logitech G9


5 answers Last reply
More about operating system missing
  1. Check all of your HDD's detected in BIOS. Especially the HDD where OS is installed.

    Try a reinstall, if it fails go for a fresh clean installation, formatting C: drive.
  2. do you have access to another computer that can get on the net, download The Ultimate Boot CD, and use the tools on it, sounds like the HDD died
  3. Okay, it's weird, but the entire problem is fixed. The missing operating system message came from loading the "Optimized defaults" in the BIOS, which disabled the RAID. When I enabled the RAID again, the operating system was found again. What is weird tho, is that it also doesn't crash on login anymore... Strange.
  4. glad it was a simple fix
  5. Happy to see your system working fine & your Problems solved :)
    You are always welcome to this forum with any kind of system problems! :)
    We are here to help you any time :)
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