Make sure the MAPROM jumper is not enabled if you're not trying to soft kick your ROM.
Also try disabling the card (using the keyboard short-cuts, I can't remember what they are) and make sure your 1200 boots ok (make sure you have an OS install that will actually load with 2MB RAM).
Blizzard 1230's don't really need much power so that's probably not your issue, have you tried a clean (or ClassicWB) OS install with it?
Has the card ever worked?
