PC bios confused in which harddrive to boot fedora OS: Reboot and select proper boot device or insert boot media!

["Excalibur Xcalibur" <excalibur xcalibur gmail com>]

Hi All,
          This is a rather unusual situation. I have a server running fedora linux OS with a 650 Gb Seagate Barracuda Harddrive. Now I  wanted to mirror the server with an identical harddrive. When I plugged my new harddrive in, I got the message:

"Reboot and select proper boot device or insert boot media"

It seems that because it's an identical harddrive (with not OS though), the PC doesn't *see* which one is the correct boot harddrive. Weird! If a plug a different harddisk than the one with the  linux OS, they system boots up. Any clues on how to fix this problem? 


-- 
Peter "Excalibur"