Just nailed my BIOS & Vista partition

[Hadders]

Wow! That was an interesting result from Grub, I'd never have expected 
that, though I can't blame Grub as it was most likely my fault.

I was trying to get it so I can boot my second hard drive, hd1 and get 
its XP to load from Grub.
Choices would be Linux, Vista or XP.
I was in the command-line and typed
rootnoverify (hd1,0)
hide (hd0,0)
makeactive
chainloader +1
boot

Made sense to me, I figured it would be all good. But!! It wasn't. 
Instead Vista started to load (that's hd0,0), so I'm confused as to why 
XP (hd1,0) didn't.
Oh well I thought, anyway, half way through the load Vista command 
console comes up and says "autocheck program not found".... umm, okay I 
thought, then I hear *click* *tink* and the hard drives are turning off, 
WTF! Next thing I know the machines posting with a WIDE RANG BIOS 
ERROR.... WTF! 

So I recovered to previous (thank you gigabyte for dual bios)...

Okay, so Grub clearly upset Vista by "switching"/"hiding" things. But..
1... why didn't that work to boot XP
2... surely it was Vista that got upset and did bad bios things right... 
there's no way Grub could have done that?!

H