Windows 2000 überschreibt den MBR nicht automatisch, aber Windows XP.
Vielleicht ist bei SUSE eine Live CD dabei. Wenn nicht kannst du mit Knoppix den grub so noch mal neu installieren.
(Wenn du Englisch nicht so gut kannst, brauchst du nur diese drei befehle nacheinander eingeben):
3.2 Installing GRUB natively
Caution: Installing GRUB's stage1 in this manner will erase the normal boot-sector used by an OS.
GRUB can currently boot GNU Mach, Linux, FreeBSD, NetBSD, and OpenBSD directly, so using it on a boot sector (the first sector of a partition) should be okay. But generally, it would be a good idea to back up the first sector of the partition on which you are installing GRUB's stage1. This isn't as important if you are installing GRUB on the first sector of a hard disk, since it's easy to reinitialize it (e.g. by running `FDISK /MBR' from DOS).
If you decide to install GRUB in the native environment, which is definitely desirable, you'll need to create a GRUB boot disk, and reboot your computer with it. Otherwise, see Installing GRUB using grub-install.
Once started, GRUB will show the command-line interface (see Command-line interface). First, set the GRUB's root device1 to the partition containing the boot directory, like this:
grub> root (hd0,0)
If you are not sure which partition actually holds this directory, use the command find (see find), like this:
--------------------------------------------------------------------
>>>>>Gib erstmal diesen Befehl in einer Konsole von Knoppix oder SUSE Live CD ein.
1. grub> find /boot/grub/stage1
Die Ausgabe dieses Befehls nimmst du als Argument für
2 grub> root (hd0,0)
-------------------------------------------------------------------
This will search for the file name /boot/grub/stage1 and show the devices which contain the file.
Once you've set the root device correctly, run the command setup (see setup):
grub> setup (hd0)
This command will install the GRUB boot loader on the Master Boot Record (MBR) of the first drive. If you want to put GRUB into the boot sector of a partition instead of putting it in the MBR, specify the partition into which you want to install GRUB:
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Wenn grub wieder in den MBR installiert werden soll:
Am Ende :
3. grub> setup (hd0,0)
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If you install GRUB into a partition or a drive other than the first one, you must chain-load GRUB from another boot loader. Refer to the manual for the boot loader to know how to chain-load GRUB.
After using the setup command, you will boot into GRUB without the GRUB floppy. See the chapter Booting to find out how to boot your operating systems from GRUB.
Zum Nachlesen:
http://www.gnu.org/software/grub/manual/html_node/Installing-GRUB-natively.html#Installing-GRUB-natively
http://www.gnu.org/software/grub/manual/
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