| If the board has a working bootbloc. | Disconnect AC, Insert Recovery Floppy, Reconnect AC and  Turn On. Wait for some time (or steady postcode 28)  | 
  
| If board boots from floppy. | Boot from Recovery Floppy. Wait for steady DOS prompt. | 
| If FWH is socketed. | Program BIOS into FW4 and replace. |