80386DX won't boot to CompactFlash drive

Attempting to upgrade my 80386DX to a CompactFlash drive using IDE to CF adapter. Was able to FDISK and setup a 504MB partition and install DOS 6.22 without any issues, but when I reboot, all I get is a "j" in the left corner and the system hangs. Reverting to original hard drive and system boots fine. Any idea what is happening?


UPDATE: As so many suggested, I tried "fdisk /mbr". And that solved the problem! System booted up fine from the CF. Many thanks everyone.