Got this problem: I had Win NT installed on my small 1,6GB harddrive. I decided to add 120GB drive with Mandrake. I changed 1,6GB to secondary master and 120GB to primary master.
Everything was fine, i installed Mandrake, created partitions 7GB for Linux, 1GB for swap and 102GB for data formatted as FAT32.
Then i changed LILO to let boot NT4 from the other drive (dev/hdb1)
NT failed to boot up and i get only blank screen with cursor "_"
When i change the drive back primary master, NT boots up normally.