multiboot problem in squeeze

[Long Wind]

my hard disk looks like this:

sda1: Win XP
sda3: Mandrake 9.2
sda4: lenny

now I install squeeze at sda4
(lenny erased)

XP boots OK
but Mandrake 9.2 can't boot
(After I select Mandrade in grub menu, it reboots)

I attach grub.cfg

grub.cfg
Description: Binary data