grub booten von linux

[Schneider]

Hello,

ther is some trouble with my computer / Boot with Grub

what happens?:
just Grub stage2.. and than nothing!
it is not possible to restart the computer with  <CTRL>-<ALT>-<DEL>.
It is possible to start the computer with the installation CD by loding the 
scsi driver and the network driver.

the hardware: (device.map)
(hd0) /dev/hda
(hd1) /dev/hdb
(hd2) /dev/hdg
(hd3) /dev/sda
(hd4) /dev/sdb
(fd0) /dev/fd0

the grub.conf is looking good (goes to HD hd0, 2) which is the linux start 
partition.
no startmenu is displayed.
Know i am not able to start Windows or another Linux on hd4
what can i do?

best regards 

Andreas Schneider