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Old 09-07-2004, 08:35 AM   #1
Registered: Mar 2003
Location: UK
Distribution: Slackware 10.2, Kernel 2.6.13
Posts: 69

Rep: Reputation: 15
Unhappy Strange Dual boot Windows/Linux Problem

Hey all
I'm running Mandrake 10 in dual boot with Windows Xp. Everything was absolutely fine until yesterday when my PSU decided to die suddenly, anyway, i installed a new one and since that when i select Windows in LILO it won't boot and all i get is a flashing "_" on a black screen. I have Partition Magic 8.0 installed so i used my recovery disks to look at the partition. It said there was 2 problems and asked me if i wanted to fix them so naturally i said yes. Then i rebooted and it did the same thing, so back into partition magic i went. This time all it gave me was that the partition is bad and my only option was to format, which is a big no because there's too much stuff on there that i need to keep and far too much to backup to cd. I know that the partition being bad is not entirely the case as i can access everything just fine on my windows partition from mandrake. I remember there being a command in DOS to reset the MBR, i'm thinking of giving this a try but i don't remember the command, and then after that providing it works i'll have to re-install LILO which i also can't remember how to do. I also need to know how to make a linux boot disk. If anyone could give me any idea's at all on this it would be much appreciated.

Last edited by KiLLaWaBBiT; 09-07-2004 at 08:37 AM.
Old 09-07-2004, 09:25 AM   #2
Registered: Feb 2004
Location: Colorado Springs, CO
Distribution: Ubuntu, Fedora, PCLinux, MEPIS, still miss Libranet
Posts: 162

Rep: Reputation: 30
no problem...boot with your WinXP cd...when it asks you if you want to install windows or rescue an installed version hit r for this console type fixmbr and it will ask you "are you sure?" just hit y and enter and your master boot record will be rewritten windows style and your drive will NOT be formatted.
To get back lilo just boot with Mandrake 10 disc 1 type rescue at the prompt. A window will pop up with restore bootloader as a choice, choose it and lilo is back just like it was. I've had to do this several times myself so I know it's easy and it works.

have fun

Last edited by cedar; 09-07-2004 at 09:40 AM.
Old 09-07-2004, 09:33 AM   #3
Senior Member
Registered: Aug 2003
Location: Sydney
Distribution: debian
Posts: 1,495

Rep: Reputation: 48
There is an app on my system called 'install-mbr', which may do what you want. The standard MSDOS MBR is apparently non-free. If you have your original MBR I believe you can whack it back on the disk with

dd if=my-old-mbr of=/dev/hda bs=512 count=1

Or if you can boot into DOS, then fdisk.exe /mbr.

As a rescue disk maybe you can use your original installation CD?

Please don't take this as any sort of expert advice! This is vague recollection + 2 mins on Google. Before you do anything drastic, consider how much your data is worth, and see if you can't beg, borrow or even buy a second HD to copy your files onto.

Edit: Uh-oh, upstaged while writing my post. Looks like better advice too

Last edited by maroonbaboon; 09-07-2004 at 09:42 AM.
Old 09-08-2004, 04:34 AM   #4
Registered: Mar 2003
Location: UK
Distribution: Slackware 10.2, Kernel 2.6.13
Posts: 69

Original Poster
Rep: Reputation: 15

Thanx a lot guys, the install disc method worked a treat, much appreciated!


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