VJ,
I'm not getting enough info from your post to really have any clue what's wrong, but I can describle my setup for you, and mention a gotcha or two....
Gotcha's -
SCSI ID numbers. If the external device is set to the same ID as the recorder it would definately cause trouble. (I'm assuming you are connected via SCSI as opposed to fire-wire or direct audio link of any kind, am I correct?)
Also, SCSI termination; does the ROM self-terminate? Does it have a dipswitch to toggle termination? Maybe you need a physical terminator?
My setup -
I dont have the Korg, but I do have a HD recorder with an external ROM (Akai DPS16 and PlexWriter 12/10/32S). The way I set it up when I got my ROM was as follows:
1. power off all equipment
2. check SCSI id numbers (scour your Korg manual to find it's ID, then set the ROM to a different number. Also, the Korg manual may say to NOT use certain other numbers as well, so read carefully.)
3. attach the SCSI cable. Be very careful - those tiny "pins" in the connectors are pretty fragile, and if one of them gets bent it could lead to catastrophe.
4. power-up the ROM and awit till it is "ready"
5. power-up the Korg, and hopefully everything is working as intended!
-Shaz