[expert] Grub disappeared !

[linux . damour]

Hello,

I just changed my main HD drive and had to play a bit with drakboot to get it to 
work again after copying everything on the new disk.
Now everything is fine but grub disappeared and I'm back with lilo ?
Is there any way to use grub again (without reinstalling everything of course ?)

This must be classical and grub is not documented at all...neither drakboot.

Anyone who can help ?

TIA