Helping people with computers... one answer at a time.
Recovery disks, once you boot from them, are designed to restore your machine to factory-new condition. Whether they can depends on their assumptions.
I was recently given an old (2004) Dell Inspiron laptop, which used to have Win XP Pro as the operating system. I say "used to have," because the previous owner did a complete format of the hard drive before giving the machine to me, and it now appears to be blank. When I placed the Dell Recovery Disk in the CD drive and tried to boot the computer so the OS could be re-installed factory fresh, the only message that appeared on the monitor screen was "Boot mgr is missing." Is there some way to use another computer to install the boot manager file on the HD? When I placed the HD in an external USB housing and looked at the drive on my Win 7 computer, it appeared to be totally blank.
"Boot mgr is missing" isn't surprising given an empty hard disk. And I'll be up front and tell you that even if you could put a boot manager on that hard disk, it wouldn't help. The boot manager would simply continue to look for other things on the hard disk.
Things like the operating system.
Which isn't there.
No, the first thing we need to do is to boot from the Recovery CD.
Unfortunately, even that has only about a 50/50 chance of working.
"Boot mgr is missing" simply means that your computer's BIOS has looked at the hard disk for the next step in the boot process and found nothing there.
Not surprising, since the previous owner wiped the hard disk.
The real problem is that the BIOS shouldn't even be looking at the hard disk. What you want it to do is to first look at the CD you've inserted, and if it's present, boot from that instead. Doing that doesn't require that there be anything on the hard drive at all.
I would love to be able to tell you step by step how to get your computer's BIOS to check the CD first, but I can't. Unfortunately, exactly how you get into the BIOS settings and once in, where to look for what's called the "Boot Order" varies dramatically from computer manufacturer to manufacturer, and even model to model.
So, the best that I can offer is to check the documentation for that particular model of computer. You can probably download it from the manufacturer's support website.
Typically, it involves pressing a specific key as the BIOS performs its self tests, and then navigating through a series of menus to locate the boot order option, and then set the CD drive to be before the hard disk drive.
Once you've booted from the CD, the recovery software will guide you through the process of restoring the machine to its factory-new condition.
That may be as simple as just a lot of copying followed by a reboot, or it may be as complex as having to run and work through Windows Setup.
Either way, the key is that everything you need is on the recovery media because there's nothing on the hard disk.
It's unusual for recovery disks to actually have everything you need.
It's not uncommon that they do not contain a copy of Windows that can be reinstalled.
Instead, the recovery disk assumes that there is a recovery partition, possibly hidden, on the hard disk that has all that information. The recovery disk then steps you through the process of copying the information from that hard disk's recovery partition to the main partition, restoring your system to its factory-new condition.
It's faster and cheaper than having everything on separate recovery CDs, and it avoids some Windows piracy issues as well.
Unfortunately, if you have a new, empty hard disk, or if the hard disk in the system doesn't have the recovery partition any more because it's been wiped, then the recovery disk can't recover.
There's no recovery partition to recover the information from.
The solutions in a case like this are:
Contact the manufacturer and appeal to them for an installation, not recovery, disk. This is unlikely if the machine has changed hands, or the original operating system is very old - like Windows XP.
Purchase a retail copy of the operating system. You can then install it, perhaps updating hardware-specific drivers from the computer manufacturer's website.
Switch to a free operating system such as Linux.
Change the BIOS setting, see if booting from the recovery disk will actually recover for you.
If it does, consider yourself lucky.
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