Can't get into the BIOS

I added some RAM and the computer just kept rebooting. I finaly put everything back the way it was after 2 hours of troubleshooting and now I get

BIOS ROM checksum error
Detecting floppy drive A media
Drive A error, System halt

I know my keyboard works because without it, it will tell me
I can't get into the BOIS so I figure I have a blow motherboard thanks to the additional RAM I tried to put into it.
The computer is a ADM 3000 with 2700 RAM
Should I put this computer into the garbage can or does anyone have any ideas?

Try clearing your CMOS. Most mobos have a jumper you can use to clear the CMOS. Typically, you jumper 2 pins momentarily with the power off, then boot the system. If yours doesn't have the jumper you can remove the battery (with the power off) for a few minutes to clear the CMOS.

I drained the Cmos but still doesn't work so I will somehow have to flash the BIOS by hooking up a floppy and trying to boot into it and see what happens. Is this something I still have to worry about on the new motherboards since I'm planning on building a new computer.