Moving MBR?

[md2017]

Before:
/dev/hda Windows and MBR with Grub etc
/dev/hdb Gentoo

/dev/hda packed up -> binned.
/dev/hdb now promoted to hda, but oddly enough doesn't know how to start itself.

Please could someone tell me how to make /dev/hda1 boot?

Many thanks

Nick

[moocha]

Assuming you used grub on the other drive, re-run grub-setup like you did when you installed it.
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[racoontje]

Yup. Boot livecd, mount everything the way you want it to be mounted (except under /mnt/gentoo instead of /, as with install), chroot, and you're in. Then just install grub as per usual (as in installer). You may want to edit /etc/fstab too.