Frequently Asked Questions for FreeBSD 2.X : Installation : When I boot FreeBSD it says ``Missing Operating System''.
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3.8. When I boot FreeBSD it says ``Missing Operating System''.

See question above. This is classically a case of FreeBSD and DOS or some other OS conflicting over their ideas of disk geometry. You will have to reinstall FreeBSD, but obeying the instructions given above will almost always get you going.

Frequently Asked Questions for FreeBSD 2.X : Installation : When I boot FreeBSD it says ``Missing Operating System''.
Previous: I want to install FreeBSD onto a SCSI disk that has more than 1024 cylinders. How do I do it?
Next: When I install the boot manager and try to boot FreeBSD for the first time, it just comes back with the boot manager prompt again.