Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Boot Mischief: What causes "Missing Operating System" msg?

20 Aug 2014   #1

Windows 7 Pro 64 bit
Boot Mischief: What causes "Missing Operating System" msg?

I'm a novice, but puzzled, I love getting to the bottom of things. Here's one I'm working on, but I'm at an impasse (I'm going to run out of time, school starts next week):
After a re-install of Windows 7 Pro on Lenovos Desktop with WD5000AAKS drive, I get "Missing Operating System" when the machine is rebooted with no disk in the drive.
Machine boots if I put GRMCPRXFRER_EN_DVD (the Windows 7 Install Disk) in the drive before powering up or Restart.
I've re-installed more than a half dozen times with same outcome.
I've tried re-installing from 2 sources, the above mentioned Windows 7 Install Disk, and a Restore Disk from Lenovos, both gave same outcome. Each source was tried several times, same outcome each time.
I've tried switching the HDD mode between RAID and ACHP(?), same outcome each mode.
I've tried re-installing the Western Digital HDD driver, same outcome.
My disk partition is:

Attached Images
My System SpecsSystem Spec

20 Aug 2014   #2

Dual Boot: Windows 7 Pro & Server 2012r2 VMs: Kali Linux, Backbox, Matriux, Windows 8.1

Hi Chaim, this error can generally only mean two things. Your hardware failure or your MBR is damaged.

Try to follow the steps here:
Missing operating system: Windows 7 (2014 Update)
My System SpecsSystem Spec
20 Aug 2014   #3
Microsoft MVP


Please stop creating new threads for this. I was helping you in another thread which was abandoned without reply to steps I gave you.

Work through these steps for Overcoming Windows 7 Installation Failures - Windows 7 Help Forums . Do not skip any steps including trying new installation media ISO burned to stick or written to disk with tool provided.

If it still fails test your hard drive and RAM from Troubleshooting Steps for Windows 7
My System SpecsSystem Spec


 Boot Mischief: What causes "Missing Operating System" msg?

Thread Tools

Similar help and support threads for2: Boot Mischief: What causes "Missing Operating System" msg?
Thread Forum
Sony Vaio Win7 "Operating System Not Found" - missing data files General Discussion
Missing operating system" error massage when system starts General Discussion
Solved Win7 pro startup error "Boot MGR missing"/"Operating System Not Found Installation & Setup
Unable to boot following BSOD: "Loading operating system" hang BSOD Help and Support
system cold boot hangs at "loading operating system" BSOD Help and Support

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 05:04 AM.
Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33