Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Today when I went to boot into Windows 7, I was surprised to see that the option to boot into Windows was missing in the OS X boot manager (by holding down option). In an attempt to fix this, I installed the rEFIt boot manager. The Windows partition shows there, but once i select it it starts to boot Windows, until I get the following error message:

Missing operating system

What? Why?

I am quite sure that the operating system and all it's data is still there, but I just seem unable to boot into it. What can I do to force my Macbook to boot to it? Am I able to 'rebuild' the boot manager or partition table?

share|improve this question
1  
The "missing operating system" error gives me nightmares. It usually occurs when you have some major issues with your hard drive and/or boot sector. But on a Mac it seems even harder to solve. –  alex Dec 18 '09 at 9:23
add comment

2 Answers

up vote 1 down vote accepted

It seems that the Windows 7 partition has been corrupted in some ways (happens to me with Vista when installing Snow Leopard).

Do you have access to the Windows 7 partition from OS X ? If yes, then perform a backup. Then, boot on the Windows 7 DVD to see if you can perform a system recovery.

share|improve this answer
add comment

I had this problem when I tried (unsuccessfully) to triple-boot my system to include Ubuntu. The fix is to boot into the Windows 7 disk, and allow it to detect that there is a problem with the boot area. It should fix it then. This page might also be of assistance.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.