dittos, I believe I pointed out pretty much everything you can try to recover you system using a properly prepared floppy disk. If there is no access to the internal floppy drive even after a CMOS Clear with the system in barebone configuration, the boot block was probably corrupted. In that case, there is no recovery routine available anymore that could kick in to save your system.
When you are sure, that you tried everything I mentioned above, the next step you should consider is a BIOS Chip replacement. That is quite easy to accomplish and your board should be back up and running in no time. Have you checked, if the BIOS Chip is really removeable on your board?